Knowledge for better food systems

Showing results for: Primary production: Aquaculture and fisheries

Fish and seafood constitute an important part of diets around the world and are a key source of protein and essential fatty acids (such as omega 3). Over the past 50 years however, overfishing and destructive fishing techniques have caused dramatic reductions in wild fish stocks. Around 85% of fisheries are now fully exploited or overfished, and many of the ecosystems associated with fishing activities have been severely damaged. With growing populations and increasing per capita protein demand, producing sufficient fish to fulfil demand has prompted a focus on aquaculture: the farming of fish and seafood. Aquaculture is the most rapidly expanding subsector of the animal production sector and it now exceeds capture fisheries as an aquatic food source. While there is significant potential for aquaculture to reduce some of the pressures on wild fish stocks, the sector also generates its own environmental problems. The farmed aquatic sector is however hugely diverse – from modern closed recirculating systems through to traditional integrated ones (involving production of both fish, livestock and agriculture) – making it difficult to generalise.

24 April 2019

This book gives an overview of aquaponics systems, i.e. combined production of fish and crops, and their social, economic and environmental implications.

24 April 2019

This report from the US-based campaigning organisation Changing Markets Foundation examines the impacts of catching wild fish to feed to farmed fish in aquaculture operations, i.e. reduction fisheries.

Image: Eric, Cooked shrimp, Flickr, Creative Commons Attribution 2.0 Generic
24 April 2019

This paper quantifies the resource use implications of replacing fishmeal with plant-based ingredients in the feed used to farm shrimp. It finds that increasing the proportion of plant-based ingredients in shrimp feed could reduce pressure on marine resources, at the cost of increased use of freshwater, land and fertiliser.

Image: Romaniamissions, Fishing boats Spain, Pixabay, Pixabay Licence
12 March 2019

This paper retrospectively models the impacts of ocean warming on the productivity of 235 fish populations around the world representing around one third of reported global catch. It uses a temperature-dependent population model to estimate that the overall maximum sustainable yield of the fish populations dropped by 4.1% between 1930 and 2010.

Image: Phil Manker, Swirling fish schools, Wikimedia Commons, Creative Commons Attribution 2.0 Generic
12 March 2019

This paper models the impacts that the Paris Agreement on climate change would have on seafood production. It finds that three quarters of maritime countries would benefit from the Agreement’s implementation.

Image: Narek75, Recirculating Aquaculture System, Wikimedia Commons, Creative Commons Attribution-Share Alike 4.0 International
18 February 2019

Aquaculture generally supplements wild fisheries rather than replacing them, according to this paper, which used models based on historical data.

11 February 2019

This report, part of the UK Food Research Collaboration’s Food Brexit Briefings series, argues that the UK’s exit from the European Union will not solve the fishing industry’s problems - rather, that international fishing rules, overfishing and the UK’s own policies have contributed to those problems.

Image: Max Pixel, Plant field summer, Creative Commons CC0
4 February 2019

These three audio reports from the Wall Street Journal explore the impact of climate change on commercial fisheries, cattle genetically engineered to tolerate higher temperatures, and how advances in artificial intelligence and genetics could help farmers to withstand crop disease and droughts.

Image: Narek75, Tomato harvesting in Armenia, Wikimedia Commons, Creative Commons Attribution-Share Alike 4.0 International
4 February 2019

This paper maps interruptions to food production across the world between 1961 and 2013 and highlights the links and tradeoffs between events in different food sectors, including crops, livestock, fisheries and aquaculture.

Image: Crabmanners, Large Dungeness Crab, Wikimedia Commons, Creative Commons Attribution-Share Alike 4.0 International
10 December 2018

The Pacific Coast Federation of Fishermen's Associations has taken legal action against 30 fossil fuel companies, arguing that the crab fishing industry is being harmed by climate change. Algal blooms, made more likely by warming ocean waters, have cut short crab fishing seasons.

Image: Maia Valenzuela, translucent squid, Flickr, Creative Commons Attribution 2.0 Generic
12 November 2018

This paper assesses the possibility that cephalopods, such as squid, octopus and cuttlefish, could become a more important source of food in the future. In contrast to many fish population, cephalopod populations have been rising over the last few decades, possibly due to warmer ocean temperatures. The paper gives an overviews of the nutrients provided by cephalopods and the ways that they can be used as food. The authors also note that some cephalopods, including the octopus, are intelligent and possibly sentient, raising ethical issues over their use as food.

16 October 2018

This book, by Simon R. Bush and Peter Oosterveer, examines the sustainability, governance and future of seafood.

Image: skagman, Modern trawler, Skagen harbour, Denmark, Wikimedia Commons, Creative Commons Attribution 2.0 Generic
18 September 2018

The vast majority of industrial fishing (defined as fishing vessels of over 24 metres) is done by vessels that are registered to relatively wealthy countries, according to a recent paper. Vessels registered to high income and upper middle income countries (according to World Bank classifications) accounted for 97% of industrial fishing effort in international waters and 78% of industrial fishing effort in the national waters of poorer countries. China, Taiwan, Japan, South Korea, and Spain together account for most of the fishing effort.

Image: David Stanley, Net full of fish, Flickr, Creative Commons Attribution 2.0 Generic
12 September 2018

Fishers increase their fishing activity prior to the establishment of a new marine reserve, a new paper claims. The study used satellite data to study one particular marine reserve, the Phoenix Islands Protected Area (PIPA). While fishing effort dropped to almost zero after the marine reserve was established, fishing effort prior to the reserve’s establishment was 130% higher than in a control region (where no reserve was planned).

Image: TonyCastro, Guanay Cormorant, Wikimedia Commons, Creative Commons Attribution-Share Alike 4.0 International
12 September 2018

Attaching green light emitting diodes (LEDs) to gillnets (vertical fishing nets that catch fish behind the gills) reduces the number of guanay cormorants accidentally caught by 85% relative to control nets with no lights, reports a recent paper. A previous study of the same fishery has shown that illuminating nets can reduce bycatch of green turtles by 64% without reducing catch rates of the target species (the current paper did not specify catch rates of the target species). The authors hypothesise that it may be possible to tailor the wavelength of light to attract or repel specific species, according to a fishery’s needs.

Image: Cliff, Swirling schools of Anchovies, Wikimedia Commons, Creative Commons Attribution 2.0 Generic
4 September 2018

Farmed fish are often fed on forage fish (such as anchovies and sardines) caught from the wild. A new paper points out that demand for forage fish to support aquaculture production is forecast to grow beyond the maximum sustainable supply level. The authors calculate that demand for forage fish could be reduced to below the maximum supply limit by combining a number of measures: reducing use of forage fish in land-based agriculture, replacing some forage fish with fish trimmings from processing, and reducing the proportion of forage fish in the diets of non-carnivorous farmed fish.

31 July 2018

The FAO has released a report on the current state of knowledge on how climate change will affect fisheries and aquaculture, including mitigation and adaptation options. The report finds that “climate change will lead to significant changes in the availability and trade of fish products”. Marine catches could decrease by 2050 in the tropics and rise in some high latitude regions, with a global decrease in Exclusive Economic Zones of 3% to 12%. Inland fisheries in Pakistan, Iraq, Morocco and Spain may come under greater stress, while those in Myanmar, Cambodia, the Congo, the Central African Republic and Colombia may remain under low stress in the future.

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