Knowledge for better food systems

Showing results for: Marine and aquatic ecosystems

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: 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: Chaos07, Recife coral reef mar, Pixabay, CC0 Creative Commons
20 August 2018

The first systematic analysis of marine wilderness around the world finds that only 13% of the ocean can still be classed as wilderness, i.e. having experienced low impacts from human-caused stressors such as fertilizer runoff, fishing and climate change. Only 4.9% of that wilderness (covering 0.6% of total ocean area) falls within official marine protected areas.

24 July 2018

The FAO has released its 2018 report on world fishery and aquaculture statistics. Key findings include that fisheries output peaked in 2016, having remained approximately static since the late 1980s, while aquaculture production is rising, as shown in the figure below. In 2015, fish accounted for around 17% of global animal protein consumption. One third of fish stocks are currently overfished, although progress has been made in the United States and Australia in increasing the proportion of fish stocks that are sustainably fished.

Image: Lynn Betts, Runoff of soil & fertilizer, Wikimedia Commons, Public domain
21 May 2018

Structural changes in the food system such as replacing half of animal proteins with plant-based proteins could significantly marine eutrophication in the North-East Atlantic, according to a recent paper. The authors addressed the question of whether Western Europe can reduce nitrogen and phosphorus runoff to coastal areas without endangering food security.

15 May 2018

A report by WWF, The Rivers Trust and The Angling Trust finds that only 14% of rivers in England are classed as healthy, with damage being caused by poor farming and land management practices, for example by degraded soil being washed into watercourses and agricultural chemicals contaminating groundwater. The report sets out a strategy for managing both soil and water health, including stricter control of slurry storage, incentives for farmers to plant woodland or create wetland habitats and creating an advice service for farmers and land managers.

Image: MOAA, Satellite image and illustration of a dead zone in the southern U.S., Wikimedia Commons, Public Domain
9 May 2018

In this TED talk, ocean expert Nancy Rabalais discusses the “dead zone” in the Gulf of Mexico - an area of the ocean where there isn’t enough oxygen to support sea life. Fertiliser runoff from farmland further up the Mississippi River is causing the dead zone, according to Rabalais. She says that solutions could include growing perennial grains and using precision fertilisation.

Image: Brocken Inaglory, Total internal reflection of Chelonia mydas, Wikimedia Commons, Creative Commons Attribution-Share Alike 4.0 International
9 May 2018

Many important marine species, including marine mammals, sea turtles and seabirds, are threatened by bycatch - i.e. being accidentally caught by fishers who are targeting other species. A new paper finds that around half of the populations threatened by bycatch could be protected by managing fish stocks to maximise fishery profits, which would reduce bycatch as a side-effect of reducing overfishing.

30 April 2018

This book, edited by Faisal I. Hai, Chettiyappan Visvanathan and Ramaraj Boopathy, discusses the social, economic and environmental sustainability implications of various aquaculture practices.

Image: John Wallace, A mountain of dogfish (Squalus acanthias) caught during a trawl survey. California, Southern California Bight, Wikimedia Commons, public domain.
6 March 2018

This paper presents the findings of a large-scale study which used global tracking data on sea-going vessels to characterise the scale, distribution and drivers of the global fishing effort.

12 December 2017

The planetary boundaries concept provides a theoretical upper limit on human activity which the planet is able to sustain without major perturbation to the current ‘Earth system’. Previously, nine planetary boundaries (PBs) have been proposed and recently Steffen et al. (2015) have updated these boundary definitions and assessed the current state of the position of human activity with respect to each boundary. In this article, researchers from a number of food, climate change, agricultural and environmental research institutions around the world build on this work by assessing the impact of agriculture on each PB status, based on a detailed literature review of the available research.

Photo: S Khan, Shrimps, Flickr, Creative Commons License 2.0 generic.
16 May 2017

This research calculates the carbon footprint of a meal to give a tangible example, aimed at the public in the US, about how daily food decisions can affect deforestation and greenhouse gas emissions (GHGe). The study uses a life-cycle assessment (LCA) approach that takes into account GHGe arising from the conversion of mangrove to cattle pastures and mangrove to shrimping ponds as well as from forests to pasture (cattle induced deforestation). 

Photo: natalienicolecrane, fishing at lake victoria, Flickr, Creative Commons License 2.0 generic.
8 May 2017

A common hypothesis used to link declining human health to environmental outcomes predicts that illness will reduce human populations or harvest effort, thus benefitting the environment. When investigating the behaviour of fishers around Lake Victoria in Kenya, this research found little evidence that illness reduced fishing effort to indirectly benefit the environment. Instead, ill fishers shifted their fishing methods – using more illegal methods concentrated in inshore areas, that are less physically demanding but environmentally destructive.

Pages