A new study shows that seagrass fisheries provide a reliable safety-net for poor fishermen, since they perceive those habitats to maintain large fish catches over time. Surprisingly, even more so than coral reef fisheries, which people normally associate with small-scale fishery. Seagrass meadows are routinely used as a fishing habitat
Mosquito nets designed to prevent malaria transmission are used for fishing which may devastate tropical coastal ecosystems, according to a new scientific study. The researchers found that most of the fish caught using mosquito nets were smaller than a finger and potentially collect hundreds of individuals. Malaria is a serious
The weather in Scotland has been beautiful recently making the start of my Spring fieldwork very enjoyable – although surface water temperatures of 7 or 8℃ was a swift reminder that winter has only just left us! Last week I was very lucky to be shown around the Taynish peninsula
To give you a bit of an introduction, I am a Cardiff University Genetics (BSc) student going into my final year of my degree and have joined Project Seagrass for a Cardiff University Research Opportunities Programme (CUROP) summer research placement, at their offices in the Sustainable Places Research Institute. I
A guest blogger? But why should I bother reading what he has to say? Well here’s a bit about me…. Originally hailing from Melton Mowbray, a small town in the middle of England known solely for producing pork pies and stilton cheese, my initial foray into marine science began with
Seafood consumption is both a love and a necessity for hundreds of millions of people all across the world. And the supply of seafood is a key part of maintaining food security for the whole planet. But as demand for seafood is increasing, stocks of wild fish and invertebrates (such
At least 7.3m tons of fish (usually dead or dying) are thought to be discarded each year from marine fisheries around the world. But these estimates come mostly from observations of large-scale industrial fisheries. Limited attention has been paid to small-scale fisheries, which are assumed to have low discard rates – some
Britain’s seagrass is a refuge for numerous species of fish, stabilises sandy beaches, and helps to lock away the carbon which humans produce. The meadows that surround the country’s coast have been called the “canaries of the sea”, due to their sensitivity to a changing environment. And like a canary
Fishing in seagrass occurs around the globe; if there is seagrass (and people) there is fishing. Still, the nature and extent of fisheries in seagrass is poorly understood. It is a prerequisite for natural resource management to understand resource exploitation, therefore we decided to investigate this further. Seagrasses are plants that
 Hurricane Irma – one of the strongest on record to hit the Caribbean – recently scoured the islands leaving catastrophic damage in its wake. And just as we began to piece together the devastating and potentially long–term impacts of Irma, Hurricane Maria has now left another path of destruction.
A new study shows that seagrass fisheries provide a reliable safety-net for poor fishermen, since they perceive those habitats to maintain large fish catches over time. Surprisingly, even more so than coral reef fisheries, which people normally associate with small-scale fishery. Seagrass meadows are routinely used as a fishing habitat across the Indo-Pacific region to sustain millions of households by providing fish and other animals for food and income from fishing. A new study in Ocean and Coastal Management investigated how and why households use seagrass meadows across Cambodia, Tanzania, Sri Lanka and Indonesia in the Indo-Pacific region by conducting interviews that asked what habitats they used and which they preferred. Benjamin Jones, director of Project Seagrass and PhD student at the Department of Ecology Environment and Plant Sciences, Stockholm University, says: “Seagrass was the most common habitat used for fishing. Nearly half of all households we talked to preferred fishing in seagrass over other habitats such as coral, mangroves, open ocean, mud and rock for example. This was surprising because most people think of reef fisheries as the key tropical small-scale fishery, but we show that its actually engagement in seagrass fisheries that are much more characteristic of households.” When the researchers asked the fishermen why they preferred seagrass, they expressed a general feeling of reliability: seagrass meadows always provide large catches and fish and invertebrates are always found there. This is likely due to the ecological role that seagrass meadows play for fish. They provide valuable nursery habitats with lots of places for fish to hide and grow which means that there is often a high abundance of fish present. The study also revealed that 3 in 20 people across the region were reliant on seagrass meadows as their fishing ground and did not fish anywhere else. The research from households in 147 villages also revealed that reliance on seagrass meadows was strongly influenced by household income: “Household income had two different effects. On one hand, poorer households were less likely to own motorboats. These were reliant on seagrass as they were unable to fish elsewhere, seagrass is close to shore and easy to access without a motor. On the other hand, wealthier households were more likely to own certain types of fishing gear that incentivized them to use seagrass due to high rewards and low effort requirements. These were static fishing fences that don’t require a fisherman to be present” says Benjamin Jones. Study co-author and fellow Project Seagrass director Leanne Cullen-Unsworth, says “Our results highlight the need for empirical household scale data for management of seagrass meadows. People use and value seagrass for many different reasons so safeguarding seagrass is vital to ensure that all people, all of the time, have equitable and equal access to the resources seagrass provides.” The study was a collaboration between scientists from Stockholm University, Project Seagrass, Swansea University, Uppsala University, Hasanuddin University, among others. Open Access paper: Jones, B.L.H.; Unsworth, R.K.F.; Nordlund, L.M.; Eklöf, J.S.; Ambo-Rappe, R.; Carly, F.; Jiddawi, N.S.; La Nafie, Y.A.; Udagedara, S.; Cullen-Unsworth, L.C. Dependence on seagrass fisheries governed by household income and adaptive capacity. Ocean & Coastal Management 2022, 225, doi:10.1016/j.ocecoaman.2022.106247.
Mosquito nets designed to prevent malaria transmission are used for fishing which may devastate tropical coastal ecosystems, according to a new scientific study. The researchers found that most of the fish caught using mosquito nets were smaller than a finger and potentially collect hundreds of individuals. Malaria is a serious global health issue, killing nearly half a million people every year worldwide. Aid organisations like the Bill and Melinda Gates Foundation have invested in solutions to solve the crisis such as distributing hundreds of thousands of bed nets to protect people from mosquito bites carrying the virus. “Distributed mosquito nets are intended to be used for malaria protection, yet communities living in poverty use them for fishing, providing fresh concerns for already overfished coastal ecosystems, says,” Benjamin Jones, a director of Project Seagrass and PhD researcher at Stockholm University Department of Ecology, Environment and Plant Sciences. There are few studies that investigate how much fish mosquito-net fishing potentially harvests, although the use of mosquito nets for fishing is not a new phenomenon: “No evidence on the sheer amount of fish that these fisheries extract has been published that we are aware of. Gaining an understanding of these catches is vital if we are to manage such fisheries,” says Benjamin Jones. In Mozambique, each sweep of the mosquito net caught more than half of the average daily catch (2.4 kg a day) using traditional nets, by weight. But many of the fishes were very small, which means mosquito net fishers who cast their nets many times each day are removing a huge number juvenile fish to eat. Many of the species caught are important for food in the region when adults or help keep the seagrass ecosystems where they are found healthy. “The use of mosquito nets for fishing may contribute to less food availability, greater poverty and the loss of ecosystem functioning,” concludes Dr Richard Unsworth, a co-author and Lecturer in Marine Biology at Swansea University. Finding a solution to the problem is incredibly hard, but the researchers suggest the need for marine scientists, social scientists, health professionals and fishing communities to all work together. Laws imposed from governments make the use of mosquito nets for fishing illegal in some localities, however, such mechanisms are evidently insufficient because people still need food and “need re-thinking” according to the study. “We need to know why communities aren’t using these nets for intended use, and therefore we have to involve them, so they can be part of developing solutions to these challenges,” says Richard Unsworth. The team collected data at seagrass meadows by ten coastal villages in northern Mozambique. Identifying each fish species, the researchers recorded the weight of each fish group and the total catch, as well as age and where they are positioned in the food web. The open access paper – “The perverse fisheries consequences of mosquito net malaria prophylaxis in East Africa” – is published on Monday 11th November at https://doi.org/10.1007/s13280-019-01280-0
The weather in Scotland has been beautiful recently making the start of my Spring fieldwork very enjoyable – although surface water temperatures of 7 or 8℃ was a swift reminder that winter has only just left us! Last week I was very lucky to be shown around the Taynish peninsula (Loch Sween, Linne Mhuirich and the Sound of Jura) by members of the community group ‘Friends of the Sound of Jura.’ The Sound of Jura is home to some of the most fascinating and diverse marine life in Scotland and this community group seeks to protect the Sound from threats to the area’s wildlife, whilst championing the development of a local sustainable economy. The Friends of the Sound of Jura are an active member of the Coastal Communities Network, Scotland of which Project Seagrass is an Associated Organisation, and so this is not the first time I have had the pleasure of their company. The Sound of Jura and Loch Sween contain some of the most fascinating and diverse marine life in Scotland. The Loch Sunart to the Sound of Jura Marine Protected Area was established to protect the extraordinary flapper skate (Dipturus intermedia) that lives there. The Friends of the Sound of Jura are keen to point out that: “The International Union for the Conservation of Nature designates flapper skate as ‘critically endangered’, an unenviable category they share with the Sumatran rhino and mountain gorilla, meaning that the skate are among the rarest animals in the world, threatened with a high risk of extinction because of their rate of decline.” The first seagrass site we visited was Carsaig Bay (main blog photo) where there are two meadows of eelgrass (Zostera marina). The first in relatively continuous and extends broadly the width of the buoys within the bay. The second is a smaller patch which can be found towards the north of the bay. In the summer months these meadows are reportedly full of life, and I would suggest definitely worth a snorkel if it’s safe to do so – the beach is very accessible. Sandeels in Carsaig Bay seagrass meadow July 2017. Photo taken by Sound of Jura Seaweeds. The second site we visited was Linne Mhuirich. Here there are meadows of both Eelgrass (Zostera marina), and Dwarf eelgrass (Zostera noltii). The Dwarf eelgrass is especially prevalent in the small basin at the south of Linne Mhuirich and is known to play an important part in the winter diet of the whooper swan (Cygnus cygnus), the mute swan (Cygnus olor), the brent goose (Branta bernicla) and the wigeon (Anas penelope). An eelgrass meadows in Linne Mhuirich in March 2016. Photo taken by Sound of Jura Seaweeds. The final seagrass site is where the water enters/exits in the south of Linne Mhurich (where it joins Loch Sween). Here there are also eelgrass meadows around the Ulva Islands and Taynish Island. The seagrass meadow at Taynish Island in Loch Sween June 2017. Photo taken by Sound of Jura Seaweeds. Mapping our seagrass meadows is a priority for Project Seagrass in Scotland as we move towards a national celebration of our seas next year (2020 has been designated Scotland’s Year of Coasts and Waters). 2020 is a year that will spotlight, celebrate and promote opportunities to experience and enjoy our beautiful coasts and waters and at Project Seagrass we want to make sure that seagrass meadows are front and centre of that conversation – so that we can identifiy and engage with meaningful restoration work in areas where it is needed. The work of community organisations such as the Friends of the Sound of Jura are central to this effort, indeed as an organisation we couldn’t do half of what we do without the tireless efforts of individuals and communities on the ground (and in the water) who want to make a positive difference for their marine environment. So thanks again to my hosts last week for sharing their extensive Local Ecological Knowledge with me, I’ll be back to see you soon! RJ PS – YOU can help contribute to seagrass conservation by spotting seagrass in your area. Download the app at SeagrassSpotter.org
To give you a bit of an introduction, I am a Cardiff University Genetics (BSc) student going into my final year of my degree and have joined Project Seagrass for a Cardiff University Research Opportunities Programme (CUROP) summer research placement, at their offices in the Sustainable Places Research Institute. I stumbled upon Project Seagrass rather unexpectedly and had no idea what it was all about. Upon reading further into what seagrass is and the work Project Seagrass does, I was very keen on joining the team to learn more and take part. The Project Seagrass team are the nicest people I have worked with and maintain a lovely work environment where research and collaboration can flourish. When I first heard of the organisation, I did not know what seagrass was nor how important it is. Seagrasses are flowering plants that live in marine environments off the coast in shallow water. I know many people, including myself before this project, do not know the difference between seaweed and seagrass. Seagrass has roots, stems, leaves and flowers just like terrestrial plants do and holds some very important roles. I have learnt that seagrass is vital for: food security for coastal communities; fisheries; increasing water quality, reducing atmospheric carbon dioxide and as a food source for plant eaters like sea turtles! That is a long list of important roles which I had no clue about. This made me realise how seagrass is absent from public awareness. Rainforests get lots of publicity, yet seagrass, that can sequester carbon ~35 times more efficiently, somehow lacks it. Hopefully, in time that will change as more people realise that public awareness needs to be raised. Unfortunately due to several factors, seagrass is declining (if you want to learn about why, go to the Why Seagrass). This is catastrophic given the amount seagrass does for the marine environment as well as for us. Project Seagrass aims to push conversation efforts, educate the public and collect data on seagrass to the goal of restoring seagrass meadows to their former health and abundance. I am from a rather specialised degree, however, I found I quickly adapted to research here and am greatly enjoying it. Project Seagrass runs multidisciplinary projects which is why the collaborations are so exciting and surprising! My work itself is has been a mixed bag of literature reviews, data analysis, application development and learning lots about seagrass and citizen science. Seagrass is not sufficiently mapped due to the dynamic and vast nature of seagrass; it shrinks and grows with changing seasons and conditions. Plus, it is spread globally and is under water so it is often hard for scientists to fully monitor. This is where the use of citizen science could be a game changer. Citizen science is the participation of citizens in the collection of (usually ecological) data in collaboration with scientists. Citizen science is fantastic as it has the potential to increase data points by thousands compared to scientists collecting data alone, and it means more area is covered too. This Earth is shared by all of us so if people are passionate about conservation and want to help, citizen science is ideal. It gives individuals the chance to make a meaningful contribution to scientific knowledge as well as protect what they care about. In line with using citizen science to save seagrass, Project Seagrass has created a mobile application called SeagrassSpotter which is available on iOS and Android. SeagrassSpotter data is used to map seagrass. This is done as users report sightings of seagrass, whether it be while going kayaking or walking their dog on the beach. The report is logged in the form of a geographically tagged photo of the seagrass and is put publically on the SeagrassSpotter database so everyone can view it. Mapping seagrass is important so Project Seagrass has data that enables them to reinforce conservation action, petition for needed conservation policies, as well as make targeted actions in specific areas where more research is needed. This data would also help identify areas where seagrass has been declining and where it is still flourishing. My project concentrates on analysis of the demographics of current SeagrassSpotter users, which has never been investigated before. The demographics of users are of particular importance as we want to ensure that SeagrassSpotter is used by citizens of all ages and professions, not solely by researchers. If it turns out, participants are mainly researchers, then we need to think about how best to make SeagrassSpotter accessible and known to the wider public. If the results show that there are mainly young users, we need to find ways to make SeagrassSpotter more user friendly for the older generations. After analysing the results, I will generate applicable suggestions and improvements on how to increase citizen participation as well as ideas for technical application improvements. The demographic data is being obtained by means of a survey which was made in collaboration with, master’s student, Oliver Dalby. The survey has citizen participation motivation questions as the main portion which is what Oliver’s project focusses on. The demographic questions at the end of the survey is how the data I am analysing for my project is collected. I hope that my work will contribute to making SeagrassSpotter more widely used as well as add to the understanding the user-base of the application and what effect that has on data collection. This in turn would ideally lead to more users of the application, resulting in more data and more mapping of seagrass. The objective is to use this information to push for change to protect seagrass, subsequently saving wildlife and protecting communities. My time working on this project has opened my eyes to the importance of seagrass and its conservation. I have also learned new transferable skills as well as gained specific knowledge of citizen science. I can see the need for geneticists in seagrass research so who knows what could come of the future. I am happy to be here now and to
A guest blogger? But why should I bother reading what he has to say? Well here’s a bit about me…. Originally hailing from Melton Mowbray, a small town in the middle of England known solely for producing pork pies and stilton cheese, my initial foray into marine science began with any other child’s obsession with the beach. My parents often remind me that after hours of poking around in rockpools and catching crabs I would throw tantrums when it was time to leave the coast and return to my landlocked home. As I became older and words like career and jobs became ever more prevalent in my life, I began searching for the holy grail of adult life, a job which I genuinely enjoyed. This search led me to undertake a Bachelor’s degree in Coastal Marine Biology in the now non-existent Scarborough Campus of the University of Hull; I should clarify that my class was the last year to graduate from that tiny seaside town before the satellite campus shut down. It was during my time as an undergraduate researching in the Aegean Sea that I first encountered seagrass ecosystems and immediately fell in love. Seagrasses are the only true marine angiosperm (flowing plants) and have been described by Professor Carlos Duarte (a famous seagrass scientist) as ugly duckling ecosystems. After returning from that career changing trip all my subsequent assessments were targeted towards seagrasses as I endeavoured to learn all I could about their function, ecology and reproduction. A room with a view… daily scenery when completing Aegean seagrass surveys. This obsession permeated through to my Master’s degree at the University of York in Marine Environmental Management where my supervisor shared a passion for these underappreciated ecosystems; it seemed fate had brought two seagrass nerds together at last. As I continued through the MSc with a specific focus on seagrasses when possible there came a time where I had to find an external placement partner to complete my second thesis with. Being still constrained firmly to the student financial situation I did not have the prospect of travelling to far flung places as some of my peers. However, this hardly mattered as my first choice was to work with the only active group of seagrass researchers in the UK, Project Seagrass! After finalising the logistics of the project and “upping sticks” to Cardiff in mid-July I now right this blog post sat at a desk in Project Seagrass HQ nestled in a surprisingly sunny Cardiff. But that’s enough about me, let’s talk seagrass citizen science! The project I am completing investigates the motivations, benefits, barriers and changes in knowledge associated with taking part in seagrass citizen science projects, specifically SeagrassSpotter and Seagrass-Watch (follow the links if you want to learn more about these projects). More broadly the project sets out to discover who is taking part, why they take part and when they take part. The project itself is being co-managed by myself and Isadora Sinha of Cardiff University who is heading up the demographics (the who) associated with the project. Throughout the project we utilised an online questionnaire which has been disseminated to current users of SeagrassSpotter, Seagrass Watch, and various seagrass-based email and social media groups (yes seagrass Facebook groups exist, if you’re interested you should join one). Given that citizen science, the participation of non-scientists in scientific research, has been labelled as a source of large data sets across varied space and time, seagrass citizen science has the potential to alleviate some of the primary threats these ecosystems face. Talking all things seagrass citizen science at a workshop organised by Cardiff University. Seagrasses are thought to be declining at around 7% a year, with declines primarily due to changes in water quality and increases in suspended sediments which reduce the ability of the plant to photosynthesise by blocking available sunlight. Additionally, researchers have little idea of local spatial coverages of seagrasses due in no short part to a chronic lack of public awareness of their existence; a concept which doesn’t apply to more charismatic ecosystems such as coral reefs. This decline represents not only the loss of a beautiful marine habitat (see the photo below if you don’t believe me) but also the services these ecosystems provide. Seagrasses are present on the coastal fringes of almost all continents worldwide where their presence promotes high primary and fisheries productivity, in turn supporting food security worldwide. You know the cod that forms an integral part of your chippy tea? Well it probably spent a good part of its juvenile years living in and around seagrass meadows. Seagrasses also add 3D structure to muddy bottoms, enhancing sediment capture which stabilises coastlines against erosion and acts to trap carbon dioxide helping to combat climate change. It is therefore hoped that by better understanding why people take part in seagrass citizen science we can reduce barriers to participation and increase public awareness and conservation of these crucial ecosystems. The project also represents the first time these topics have been studied in a seagrass specific context so will provide much needed insight into the finer state of seagrass citizen science. For a global review of seagrass citizen science see this article led by Project Seagrass Director Benjamin Jones (sorry, it’s not open access). At the time of writing the survey has been sent to over 1000 people and has been completed around 60 times. This may not seem like a worthwhile return, but such a small number of responses is common among online surveys. Results from the survey are being collated currently and will be prepared ready for my MSc thesis submission in early September. So, watch this space for seagrass updates! Together we can promote conservation and raise awareness of seagrasses to help this ugly duckling become beautiful swan.
Seafood consumption is both a love and a necessity for hundreds of millions of people all across the world. And the supply of seafood is a key part of maintaining food security for the whole planet. But as demand for seafood is increasing, stocks of wild fish and invertebrates (such as mussels and prawns) are declining. A major problem is that policies and plans designed to ensure the sustainability of our fisheries almost exclusively target fishing activity. But we also need to protect the critical habitats that these fisheries also depend on. Most species that are fished require more than one habitat to complete their lifecycles. For example Atlantic cod (Gadus morhua) spends its adult life shoaling in deep water, but juveniles require more stable habitat where they can hide such as seagrass meadows. So, if we want to manage stocks for sustainability, it is essential to protect the supporting habitats of targeted species. Seagrass meadows are a critical habitat supporting biodiversity and in turn the productivity of the world’s fisheries. Seagrass meadows are not only suitable for juvenile fish but also for larger fish of different species. As seagrass meadows occur in shallow, clear waters, they are an easily exploitable fishing habitat. Today, we published the first quantitative global evidence on the significant roles that seagrasses play in world fisheries . Seagrass as nursery grounds: provide a safer, less exposed, environment for eggs to be laid and young animals to find food and protection from predators as they grow. This includes commercial species such as tiger prawns, conch, Atlantic cod and white spotted spinefoot. In fact, one-fifth of the world’s most landed fish — including Atlantic Cod and Walleye Pollock benefit from the persistence of extensive seagrass meadows. Seagrass as a fishing area: it is not just large scale fishing industries that benefit from the presence of seagrass meadows. They are an easily accessible fishing ground used by small scale artisanal and subsistence fisheries around the world. Seagrass gleaning: seagrass is also essential habitat for gleaning activity, fishing for invertebrates such as sea cucumbers in water that is shallow enough to walk in. This is often done by women and children, and provides a source of essential protein and income for some of the most vulnerable people in tropical coastal communities. It is a common and increasingly visible activity, but it is not usually included in fishery statistics and rarely considered in resource management strategies. Seagrass supports other fisheries: seagrass also provides trophic support to other fisheries. They do this by creating expansive areas rich in fauna, from which there are vast quantities of living material, organic matter and associated animal biomass that supports other fisheries. Seagrasses also promote the health of connected habitats (like coral reefs), and have the capacity to support whole food webs in deep sea fisheries. Threats to seagrass, fisheries and food security: the coastal distribution of seagrass means that it is vulnerable to a multitude of land and sea derived threats. These include land runoff, coastal development, boating activity and trawling. On a global scale, seagrass is rapidly declining and when seagrass is lost associated fisheries and their stocks are likely to become compromised with profound and negative economic consequences. Seagrass meadows support global fisheries production Pdf Supporting policy and action is needed now! The importance of seagrass meadows for fisheries productivity and hence food security is not reflected by the policies currently in place. Urgent action is needed if we want to continue enjoying the benefits that healthy and productive seagrass meadows provide. Fisheries management must be broadened from just targeting fishing activity to also targeting the habitats on which fisheries depend. Awareness of the role of seagrass in global fisheries production, and associated food security, must be central to policy, and major manageable threats to seagrass, such as declining water quality, must be dealt with. Action is urgently needed to protect the worlds seagrass meadows if we are to continue to enjoy the benefits they provide.
At least 7.3m tons of fish (usually dead or dying) are thought to be discarded each year from marine fisheries around the world. But these estimates come mostly from observations of large-scale industrial fisheries. Limited attention has been paid to small-scale fisheries, which are assumed to have low discard rates – some estimate as little as 3.7% total catch, compared to more than 60% for some large-scale shrimp trawlers. Small-scale or artisanal fisheries – for which there is no universal definition – are generally considered more sustainable than their large-scale industrial counterparts, but there is increasing evidence that shows this is not always the case. They employ more than 99% of the world’s 51m fishers and likely account for more than half of the total global fisheries catches. A Sri Lankan fisherman. One of the biggest problems for both large and small-scale fisheries around the globe is bycatch – fish and other marine organisms caught when the fishers are targeting something else. Powerful images of turtles and dolphins caught in fishing gear have caught the sympathy of the general public, but unintentional landings of fish aren’t as evocative. The truth is, however, that fish bycatch is a big issue. Progress is being made in Europe within large-scale fisheries thanks to campaigns such as the Fish Fight. But small-scale fisheries – though there is increasing recognition outside that they are “too big to ignore” – are only just beginning to recognise the fish bycatch and discard problem. Catch and bycatch. Our newly published research has found that artisanal fisheries in Sri Lanka are throwing away more marine species than they keep. For every fishing trip in one of Sri Lanka’s largest lagoons, Puttalam Lagoon, fishermen could be throwing away more than 50 fish. What’s more, of the 62 species recorded in the survey, more than 80% were routinely discarded. The reasons for this practice are unclear but sometimes it is because the individual fish are too small – or they are species without a high market value. We found that fishers targeting shrimp in particular caught more non-target species and had higher discards than those targeting fish. This is particularly worrying at a time when Sri Lankan shrimp exports are increasing, after the EU granted the country improved access to its market. Fishers in Puttalam Lagoon discard non-target catch onshore. Potentially 90% of the world’s fish stocks are threatened by over-fishing – when more fish are caught than the population can replace. And the “tell-tale” signs of over-fishing are now being observed in Sri Lanka and across other research sites in the Indo-Pacific region. Fishers in these locations have told us and other researchers that they are catching much less fish than they were five years ago. But this is not just an ecological issue, it is a social one too. In this era of increasing food insecurity, our findings highlight a serious concern for Sri Lanka. This unwanted seafood could be used to provide protein for the poorest in society. Instead, we found that fish with high nutritional value is being eaten by feral dogs and birds. Unwanted fish end up as quick and easy meals for animals. Billions of people worldwide rely daily on fish for protein, while 50m people also rely on catching fish for work. But, if the levels of bycatch and discard continue, the livelihoods and food security of the people that depend on these fisheries will be under threat. If the problem is not managed, there won’t be any fish left in the waters. There is one ray of hope for Sri Lanka, however. There are some small-scale fishery cooperatives which maximise long-term community benefits by dealing with the threats of fisheries mismanagement, livelihood insecurity and poverty. Communities with successful and inclusive cooperatives are better off than those without. Cooperatives have the potential to empower small-scale fishers against environmental and socioeconomic shocks, but the problem in Puttalam Lagoon is that these cooperatives are not operating across all levels of society. Fishing cooperatives do exist, but there could be more. If the bycatch and discards issue is going to be solved over the long-term, we need to look at combining sustainable management practices with community schemes to reduce unnecessary seafood waste all over the world. Together the millions of small-scale fishers all over the world have an immense amount of power, they just need to realise it. This article was originally published on The Conversation. Read the original article.
Britain’s seagrass is a refuge for numerous species of fish, stabilises sandy beaches, and helps to lock away the carbon which humans produce. The meadows that surround the country’s coast have been called the “canaries of the sea”, due to their sensitivity to a changing environment. And like a canary in a coal mine, their health can be used as an indicator of the condition of coastal areas. We know that the seagrass meadows surrounding the UK are in a perilous state of decline, and our recently published research has now uncovered one of the biggest causes. Our study suggests that a major driver of seagrass decline is nutrient pollution from sewage and livestock waste. Though a new finding, it sadly comes as no surprise, given that about 40% of rivers in England and Wales are polluted with sewage. This nutrient pollution puts the long term viability of seagrass meadows in doubt. Over-enrichment results in the suffocation of seagrass. The nutrients cause microscopic algae – called epiphytes – to smother the seagrass leaves, decreasing their ability to capture light, ultimately killing them, and destroying the habitat for fish and other marine animals. Â The seagrass, Zostera marina, covered in epiphytes. In addition to this environmental impact, we found that several areas, including the Thames waterway seagrass, and a meadow in Studland Bay, Dorset – which are popular with swimmers and boaters – were considerably enriched in nutrients from sewage, livestock effluent and/or human waste. Despite this, neither location, nor any other we identified with the same problem, were classed as unsuitable for swimmers. Outdated treatment Clearly, we have a massive problem at hand – but water companies, farmers and the government have not done and are still not doing enough to prevent it. Though efforts have been made to develop a British marine protected area network, and EU legislation has improved water quality in the last few decades, we have found these initiatives to be insufficient. Ten of the 11 sites we studied were in areas with designated EU protection, but most of these seagrass meadows were still polluted with nutrients derived from urban sewage and livestock waste. So how has this happened? Analysis of the seagrass tissues points to constant sewage exposure. Old and outdated water treatment facilities are one of the likely culprits, resulting in discharges of untreated sewage during times of heavy rainfall. These are legal, but evidently the capacity of these facilities is insufficient to handle the country’s needs, and waterways are suffering because of it. There is also the problem of livestock waste. Farming is now one of the UK’s leading causes of water pollution, and inefficiencies in storage and disposal of slurry mean that it ends up in rivers and coastal waters. Local and national Evidently, in addition to national and international initiatives, we need to start quickly identifying and understanding all local threats to seagrass. Especially if we are going to harmonise conservation goals with sustainable economic development. Only by finding out specifically where the nutrients affecting seagrass areas have come from can we really start to think about a targeted solution for each meadow. Unfortunately, to date, the conservation of specific seagrass meadows is rarely based on the explicit consideration of local threats and drivers. Instead, projects focus on conserving seagrass as part of a broader plan, incorporating other specific habitats or species. While this may be effective at dealing with problems such as fisheries impacts, and is certainly a step forward for the marine environment, it doesn’t deal with the persistent and chronic problem of pollution – which can go largely unnoticed. Poor water quality isn’t just a problem for seagrass in the British Isles, it’s a global concern. But if we want to solve it, we must look beyond “protecting” seagrasses with legislation, and challenge the way we think about marine protection overall. Serious infrastructure changes and better management of river catchments – for example, restoration of riverbanks – are vital if we are going to develop long term waste water management plans that span both land and sea. You can read the study, Tracking Nitrogen Source Using δ15N Reveals Human and Agricultural Drivers of Seagrass Degradation across the British Isles, here. This article was originally published on The Conversation. Read the original article.
Fishing in seagrass occurs around the globe; if there is seagrass (and people) there is fishing. Still, the nature and extent of fisheries in seagrass is poorly understood. It is a prerequisite for natural resource management to understand resource exploitation, therefore we decided to investigate this further. Seagrasses are plants that grow in the shallow ocean. The seagrass attracts many different types of animals, to live, forage, or seek shelter. These animals are collected by humans for subsistence (food), commercial and recreational purposes. Across the globe the reasons for fishing differs, it is more common to fish for recreational purposes in countries where the economic situation is better, while in countries with more challenged economies fishing for subsistence is very important. Interestingly, because seagrasses grow in nearshore environments, almost all types of fishing gears are used. Close to shore in many areas of the world the seagrass gets exposed during spring low tides making it possible to walk in the seagrass meadows. Many people take advantage of the low tide and walk across the seagrass meadows collecting invertebrates, such as mussels and sea cucumbers, often with bare hand or simple fishing gear like sticks. This type of fishery is commonly referred to as gleaning or invertebrate harvesting and is conducted by men, women and children. Gleaning is especially common and important for people with limited resources. Static nets are also used in the intertidal zone, the area where the tides raise and fall, catching fish when the tides come in. It is very common to use hook and line and fishing nets in seagrass. Unfortunately, very destructive fishing gears such as bottom trawls, poison, dynamite, and rakes are also occasionally used. Women and children walk across seagrass meadows at low tide in indonesia collecting resources that they can eat (Photo: Benjamin Jones) On a global scale, anything found in the seagrass that can be eaten, sold, used as bait or sold as a curio is targeted. Globally, the most commonly targeted invertebrates in seagrass appear to be crabs and bivalves (mussels). The most commonly exploited finfish from seagrass are mullet, herring, and snapper. The target species varies greatly across the globe, for example in areas with high biodiversity (many types of species), the number of target species is often higher than in areas with low biodiversity. This pattern often corresponds with colder water fewer species, warmer water more species. Species groups that are least commonly targeted are sea cucumbers, small fish for drying, aquarium trade species, seahorses, and sharks. People access the seagrass fishing grounds by walking, swimming, snorkelling, free diving, use of canoes, scuba diving, use of sailboats and motorboats. Crabs and bivalves appear to be the most commonly targeted invertebrates across the globe (Photo: Benjamin Jones) Seagrass meadows receive limited management attention compared to other nearshore marine habitats. Fisheries management does not yet target seagrass. But seagrass fisheries are diverse and important to people the world over. We, authors, hope that these findings, now systematically and scientifically investigated, will highlight the importance of seagrass for fisheries around the globe. Source: ‘Global significance of seagrass fishery activity’ by Lina Mtwana Nordlund, Richard K.F. Unsworth, Martin Gullström, Leanne C. Cullen-Unsworth. Published in Fish & Fisheries 2017. Arial footage of a nearshore environment with patchy seagrass, in the upper left corner there is a fishing boat and along the right edge there is a long fishing net deployed (blue in color), Tanzania. Drone pilot and photo LM Nordlund.
 Hurricane Irma – one of the strongest on record to hit the Caribbean – recently scoured the islands leaving catastrophic damage in its wake. And just as we began to piece together the devastating and potentially long–term impacts of Irma, Hurricane Maria has now left another path of destruction. Puerto Rico, the British dependency of the Turks and Caicos, and many other Caribbean islands have suffered what have been described as “apocalyptic conditions”. When the world talks of the tragic and devastating consequences of severe hurricanes, the focus tends to be on the land, and the people who live in affected communities. Indeed, nearly 30 people have been reported killed, while Puerto Rico Resident Commissioner Jenniffer Gonzalez has said that the hurricane has set the country back by “20 to 30 years”. We see images of toppled trees, torn off roofs and severe flooding. But marine environments can be also badly affected by hurricanes, with potential long-term effects. The force of hurricane winds, and the resultant tides and waves are so strong that both plants and animals are ripped from the sea floor leaving lifeless rubble and sediment behind. Hurricanes have a washing machine effect: they mix up coastal sediments with knock-on effects for marine life. Suspended matter left floating in the water column limits the amount of sunlight that reaches marine habitats and so reduces growth and recovery. Meanwhile in shallow coastal environments, debris, sewage and run-off continue to flow in to the sea long after the hurricane has passed. Human dependency on the sea  The fishery for Queen Conch (Strombus gigas) is a major source of income to many around the Caribbean. The devastation of coastal environments, particularly seagrass meadows, can also result in long-term losses of the benefits that humans receive from them, such as fisheries support or coastal protection. Damage to these ecosystem services consequently impacts human well-being, because people can no longer rely on them for their livelihood and food supply. Some of the most severely affected areas of the recent hurricanes in the Caribbean – Florida, Turks and Caicos, Puerto Rico, Cuba and the British Virgin Islands – all house extensive seagrass meadows. These shallow water marine habitats support valuable lobster fisheries, as well as shrimp, conch, and finfish fisheries. Seagrass also stabilises sediments and protects the white sand beaches that attract so many tourists to the region. Previous hurricanes, cyclones, and typhoons (weather events which are essentially the same but have different names depending on where the storm happens) across the globe have shown the severe negative effects they can have on these vital seagrass meadows. The seagrass plants are ripped up or buried under sediments, leading to their suffocation. The extensive associated murky water leads to widespread loss of seagrass, as was seen in the years that followed hurricane Katrina hitting the US. Initial indications from the Everglades in Florida show that seagrass destruction in the wake of Irma is extensive, with large piles already being washed far onshore. This should ring alarm bells for Caribbean fisheries, as hurricanes Katrina and Rita led to losses in the seafood industry that reached billions of dollars. The Caribbean spiny lobster fishery business alone is worth more than US$450m, and directly employs 50,000 people. Healthy seagrass provides the best fishing grounds with the greatest revenue, and the recent hurricanes have the potential to decimate this. Environmental impact But this is not just about money. Seagrass loss also threatens marine biodiversity and the health of charismatic species. After a severe cyclone in Australia in 2011, turtles and dugong starved due to the damaged meadows. In addition, seagrass is a marine powerhouse, which stores vast amounts of carbon in meadow sediments. When the seagrass is removed, this carbon is released back into the environment.  Caribbean spiny lobsters depend on clams they find in seagrass. Hurricanes have always been a part of life in tropical seas. The destruction they cause and their recovery have been observed throughout human history. What is alarming now, however, is the apparent increased frequency and intensity. The already poor state of the Caribbean marine environment restricts the ability of habitats such as seagrass meadows and coral reefs to recover from the effects of severe storms. Poor water quality and over-fishing, for example, promotes the overgrowth of algae, preventing recovery. With repeated hurricanes occurring over time periods that are insufficient for recovery to occur, this will only get worse. The severity of hurricanes Irma and Maria are a wake up call. We need a fundamental shift in how marine environments are protected to enable long-term sustainability for the food and income they provide. Many locations in the Caribbean, for example Puerto Rico, have ineffective marine protection rules and so destructive practices continue unchecked, meaning that when a disaster does occur, the environment is unable to recover. Although local actions against climate change are difficult to achieve, it is possible to manage river catchments to improve water quality, and focus on small scale immediate actions, such as implementation of marine protected areas to limit immediate and direct damage to coastal resources. Coordinated small scale actions will ultimately help enhance the resilience of the Caribbean Sea, and make sure that the environment can better recover from any future extreme events. Richard K.F. Unsworth, Research Officer (Marine Ecology), Swansea University; Benjamin L. Jones, Research Assistant at the Sustainable Places Research Institute, Cardiff University; Leanne Cullen-Unsworth, Research Fellow, Cardiff University, and Lina Mtwana Nordlund, Researcher in coastal environmental sciences, Stockholm University This article was originally published on The Conversation. Read the original article.
