Fisheries and climate change
Rising ocean temperatures and ocean acidification are radically altering aquatic ecosystems. Climate change is modifying fish distribution and the productivity of marine and freshwater species. This has impacts on the sustainability of fisheries and aquaculture, on the livelihoods of the communities that depend on fisheries, and on the ability of the oceans to capture and store carbon (biological pump). The effect of sea level rise means that coastal fishing communities are in the front line of climate change, while changing rainfall patterns and water use impact on inland (freshwater) fisheries and aquaculture. The full relationship between fisheries and climate change is difficult to explore due to the context of each fishery and the many pathways that climate change affects.
Role of oceans
Oceans and coastal ecosystems play an important role in the global carbon cycle and have removed about 25% of the carbon dioxide emitted by human activities between 2000 and 2007 and about half the anthropogenic CO2 released since the start of the Industrial Revolution. Rising ocean temperatures and ocean acidification means that the capacity of the ocean carbon sink will gradually get weaker, giving rise to global concerns expressed in the Monaco and Manado Declarations. Healthy ocean ecosystems are essential for the mitigation of climate change. Coral reefs provide habitat for millions of fish species and with no change it can provoke these reefs to die.
Impact on fish production
The rising ocean acidity makes it more difficult for marine organisms such as shrimps, oysters, or corals to form their shells – a process known as calcification. Many important animals, such as zooplankton, that forms the base of the marine food chain have calcium shells. Thus the entire marine food web is being altered – there are ‘cracks in the food chain’. As a result, the distribution, productivity, and species composition of global fish production is changing, generating complex and inter-related impacts on oceans, estuaries, coral reefs, mangroves and sea grass beds that provide habitats and nursery areas for fish. Changing rainfall patterns and water scarcity is impacting on river and lake fisheries and aquaculture production. After the ice age about 200,000 years ago, the global air temperature has risen 3 degrees, leading to an increase in sea temperatures.
Fish populations of skipjack tuna and bigeye tuna are expected to be displaced further to the east due to the effects of climate change on ocean temperatures and currents. This will shift the fishing grounds toward the Pacific islands and away from its primary owner of Melanesia, disrupting western Pacific canneries, shifting tuna production elsewhere, and having an uncertain effect on food security.
Species that are over-fished, such as the variants of Atlantic cod, are more susceptible to the effects of climate change. Over-fished populations have less size, genetic diversity, and age than other populations of fish. This makes them more susceptible to environment related stress, including those resulting from climate change. In the case of Atlantic cod located in the Baltic Sea, which are stressed close to their upper limits, this could lead to consequences related to the population's average size and growth.
Due to climate change, the distribution of zooplankton has changed. Cool water cope-pod assemblages have moved north because the waters get warmer, they have been replaced by warm water cope-pods assemblages however it has a lower biomass and certain small species. Atlantic cod require a diet of large cope-pods but because they have moved pole-wards morality rates are high and as a result the recruitment of this cod has plummeted
Impact on fishing communities
Coastal and fishing populations and countries dependent on fisheries are particularly vulnerable to climate change. Low-lying countries such as the Maldives and Tuvalu are particularly vulnerable and entire communities may become the first climate refugees. Fishing communities in Bangladesh are subject not only to sea-level rise, but also flooding and increased typhoons. Fishing communities along the Mekong river produce over 1 million tons of basa fish annually and livelihoods and fish production will suffer from saltwater intrusion resulting from rising sea level and dams.
While climate change increases the effects of human activities, the inverse is also applicable. Human activities also increase the impact of climate change. Human activity has been linked to lake nutrition levels, which high levels are correlated to increasing vulnerability to climate change. Lake Annecy, Lake Geneva, and Lake Bourget were subject to experiments related to their zooplankton. Lake Geneva and Lake Bourget had relatively high levels of nutrients and responded at a significant level towards factors related to climate change, such as weather variability. Lake Annecy had the lowest amount of nutrition levels and responded comparatively poorly.
Fisheries and aquaculture contribute significantly to food security and livelihoods. Fish provides essential nutrition for 3 billion people and at least 50% of animal protein and minerals to 400 million people from the poorest countries. This food security is threatened by climate change and the increasing world population. Climate change changes several parameters of the fishing population: availability, stability, access, and utilization. The specific effects of climate change on these parameters will vary widely depending on the characteristics of the area, with some areas benefiting from the shift in trends and some areas being harmed based on the factors of exposure, sensitivity, and ability to respond to said changes.The lack of oxygen in warmer waters will possibly lead to the extinction of aquatic animals Worldwide food security may not change significantly, however rural and poor populations would be disproportionately and negatively affected based on this criteria, as they lack the resources and manpower to rapidly change their infrastructure and adapt. Over 500 million people in developing countries depend, directly or indirectly, on fisheries and aquaculture for their livelihoods - aquaculture is the world’s fastest growing food production system, growing at 7% annually and fish products are among the most widely traded foods, with more than 37% (by volume) of world production traded internationally.
Adaptation and mitigation
The impacts of climate change can be addressed through adaptation and mitigation. The costs and benefits of adaptation are essentially local or national, while the costs of mitigation are essentially national whereas the benefits are global. Some activities generate both mitigation and adaptation benefits, for example, the restoration of mangrove forests can protect shorelines from erosion and provide breeding grounds for fish while also sequestering carbon.
Several international agencies, including the World Bank and the Food and Agriculture Organization have programs to help countries and communities adapt to global warming, for example by developing policies to improve the resilience of natural resources, through assessments of risk and vulnerability, by increasing awareness of climate change impacts and strengthening key institutions, such as for weather forecasting and early warning systems. The World Development Report 2010 - Development and Climate Change, Chapter 3 shows that reducing overcapacity in fishing fleets and rebuilding fish stocks can both improve resilience to climate change and increase economic returns from marine capture fisheries by US$50 billion per year, while also reducing GHG emissions by fishing fleets. Consequently, removal of subsidies on fuel for fishing can have a double benefit by reducing emissions and overfishing.
Investment in sustainable aquaculture can buffer water use in agriculture while producing food and diversifying economic activities. Algal biofuels also show potential as algae can produce 15-300 times more oil per acre than conventional crops, such as rapeseed, soybeans, or jatropha and marine algae do not require scarce freshwater. Programs such as the GEF-funded Coral Reef Targeted Research provide advice on building resilience and conserving coral reef ecosystems, while six Pacific countries recently gave a formal undertaking to protect the reefs in a biodiversity hotspot – the Coral Triangle.
The oceans have removed 50% of the anthropogenic CO2, so the oceans have absorbed much of the impact of climate change. The famous White Cliffs of Dover illustrate how the ocean captures and buries carbon. These limestone cliffs are formed from the skeletons of marine plankton called coccoliths. Similarly, petroleum formation is attributed largely to marine and aquatic plankton further illustrating the key role of the oceans in carbon sequestration.
Exactly how the oceans capture and bury CO2 is the subject of intense research by scientists worldwide, such as the Carboocean Project. The current level of GHG emissions means that ocean acidity will continue to increase and aquatic ecosystems will continue to degrade and change. There are feedback mechanisms involved here. For example, warmer waters can absorb less CO2, so as ocean temperatures rise some dissolved CO2 will be released back into the atmosphere. Warming also reduces nutrient levels in the mesopelagic zone (about 200 to 1000 m deep). This in turn limits the growth of diatoms in favour of smaller phytoplankton that are poorer biological pumps of carbon. This inhibits the ability of the ocean ecosystems to sequester carbon as the oceans warm. What is clear, is that healthy ocean and coastal ecosystems are necessary to continue the vital role of the ocean carbon sinks, as indicated, for example, by the Blue Carbon assessment prepared by UNEP and the coastal carbon sinks report of IUCN and growing evidence of the role of fish biomass in the transport of carbon from surface waters to the deep ocean.
While the various carbon finance instruments include restoration of forests (REDD) and producing clean energy (emissions trading), few address the need to finance healthy ocean and aquatic ecosystems although these are essential for continued uptake of CO2 and GHGs. The scientific basis for ocean fertilization – to produce more phytoplankton to increase the uptake of CO2 – has been challenged, and proposals for burial of CO2 in the deep ocean have come under criticism from environmentalists.
Although there is a decline of fisheries due to climate change, a related cause for this decrease is due to over-fishing. Over-fishing exacerbates the effects of climate change by creating conditions that make a fishing population more sensitive to environmental changes. Studies show that the state of the ocean is causing fisheries to collapse, and in areas where fisheries have not yet collapsed, the amount of over-fishing that is done is having a significant impact on the industry. Over-fishing is due to having access to the open sea, it makes it very easy for people to over fish, even if it is just for fun. There is also a high demand for sea food by fishermen, as well modern technology that has increased the amount of fish caught during each trip.
If there was a specific amount of fish that people were allowed to catch then this could very well solve the problem of over fishing. This type of limit system is in place in a few countries including New Zealand, Norway, Canada, and the United States. In these countries the limit system has successfully helped in fishing industries. These types of limit systems are called Individual fishing quota. This means that the areas where this quota exist, the government has legal entity over it and in these boundaries they are entitled to utilize their ocean resources as they wish.
- Blue carbon
- Climate change and agriculture
- List of harvested aquatic animals by weight
- Sustainable fisheries
- Marine pollution
- Sarwar G.M. (2005). "Impacts of Sea Level Rise on the Coastal Zone of Bangladesh" (PDF). Lund University. Archived from the original (pdf) on 15 August 2012. Retrieved 10 September 2013.
- Observations: Oceanic Climate Change and Sea Level In: Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. (15MB).
- Doney, S. C. (March 2006). "The Dangers of Ocean Acidification" (PDF). Scientific American.
- Cheung, W.W.L.; et al. (October 2009). "Redistribution of Fish Catch by Climate Change. A Summary of a New Scientific Analysis" (PDF). Pew Ocean Science Series. Archived from the original (PDF) on 2011-07-26.
- Vincent, Warwick; et. al. "Climate Impacts on Arctic Freshwater Ecosystems and Fisheries: Background, Rationale and Approach of the Arctic Climate Impact Assessment (ACIA)". Royal Swedish Academy of Sciences. JSTOR 4315751.
- Coral reefs around the world Guardian.co.uk, 2 September 2009.
- UNEP, FAO, IOC (2009-11-25). "Blue Carbon. The role of healthy oceans in binding carbon" (PDF).[permanent dead link]
- Monaco Declaration Archived 2009-02-06 at the Wayback Machine. and Ocean Acidification Archived 2010-09-23 at the Wayback Machine. A Summary for Policymakers from the Second Symposium on the Ocean in a High-CO2 World.] Intergovernmental Oceanographic Commission of UNESCO, International Geosphere-Biosphere Programme, Marine Environment Laboratories (MEL) of the International Atomic Energy Agency, Scientific Committee on Oceanic Research. 2008.
- Manado Ocean Declaration World Ocean Conference Ministerial/High Level Meeting. Manado, Indonesia, 11–14 May 2009.
- PACFA (2009). "Fisheries and Aquaculture in a Changing Climate" (PDF).
- Changing distribution of fish in USA (Youtube)
- FAO (2008) Report of the FAO Expert Workshop on Climate Change Implications for Fisheries and AquaculturMelanesiae Rome, Italy, 7–9 April 2008. FAO Fisheries Report No. 870.
- Brander KM (December 2007). "Global fish production and climate change". Proc. Natl. Acad. Sci. U.S.A. 104 (50): 19709–14. Bibcode:2007PNAS..10419709B. doi:10.1073/pnas.0702059104. PMC . PMID 18077405.
- Ficke, A.D., Myrick, C.A. & Hansen, L.J. (2007). "Potential impacts of global climate change on freshwater fisheries" (PDF). Fish Biology and Fisheries. 17 (4): 581–613. doi:10.1007/s11160-007-9059-5.
- Handisyde, N.; et al. (2006). "The Effects of Climate change on World Aquaculture: A global perspective" (PDF). Department for International Development UK.
- Nye, J. (2010). Climate change and its effects on ecosystems, habitats and biota. (pp. 1-17). Maine: The Gulf of Maine Council on the Marine Environment.
- "Fisheries and Climate Change" (PDF). Think Asia. ADB. Retrieved 29 November 2017.
- Stenseth, Nils; et. al. "Ecological forecasting under climate change: the case of Baltic cod". The Royal Society. JSTOR 25706431.
- Allison, E. H. et al. (2005) "Effects of climate change on the sustainability of capture and enhancement fisheries important to the poor: analysis of the vulnerability and adaptability of fisherfolk living in poverty"[permanent dead link] London, Fisheries Management Science Programme MRAG/DFID, Project no. R4778J. Final Technical Report, 164 pp.
- Allison, E.H.; et al. (2009). "Vulnerability of national economies to the impacts of climate change on fisheries" (PDF). Fish and Fisheries. 10 (2): 173–96. doi:10.1111/j.1467-2979.2008.00310.x.
- Maldives President addresses the UN Climate Change Conference (Youtube)
- Halls, A.S. (May 2009). "Fisheries Research and Development in the Mekong Region". Catch and Culture: Fisheries Research and Development in the Mekong Region. 15 (1). Archived from the original on 2011-06-05.
- Perga, Marie-Elodie; et. al. "Local forcings affect lake zooplankton vulnerability and response to climate warming". ESA. JSTOR 23597124.
- WorldFish Center, 2008. The Millennium Development Goals: Fishing for a Future: Reducing poverty and hunger by improving fisheries and aquaculture Archived 2009-08-16 at the Wayback Machine.
- Garcia, Serge. "Food security and marine capture fisheries: characteristics, trends, drivers and future perspectives". The Royal Society Publishing. JSTOR 20752984.
- Portner, H & Knust, R (2007). Climate Change Affects Marine Fishes Through the Oxygen Limitation or Thermal Tolerance. Science, 315(5808), pp 95-97
- FAO (2009) The State of World Fisheries and Aquaculture Rome.
- FAO (2007) Building adaptive capacity to climate change. Policies to sustain livelihoods and fisheries
- Allison, E.H.; et al. (2007). "Enhancing the resilience of inland fisheries and aquaculture systems to climate change". Journal of Semi-Arid Tropical Agricultural Research. 4 (1).
- Dulvy, N.; Allison, E. (28 May 2009). "A place at the table?". Nature Reports Climate Change (906): 68. doi:10.1038/climate.2009.52.
- The World Bank – Climate Change Adaptation (website)
- World Bank (2009) World Development Report 2010: Development and Climate Change. Chapter 3
- World Bank (2006) Aquaculture: Changing the Face of the Waters: Meeting the Promise and Challenge of Sustainable Aquaculture
- Coral Reef Targeted Research (2008) Climate change: It’s now or never to save coral reefs CFTR Advisory Panel 2 Issue 1.
- Coral Triangle Agreement (YouTube)
- Feely, R.; et al. (2008). "Carbon dioxide and our Ocean legacy" (PDF). NOAA/Pew brief.
- Gruber N.; et al. (2009). "Oceanic sources, sinks, and transport of atmospheric CO2" (PDF). Global Biogeochem. Cycles. 23: GB1005. Bibcode:2009GBioC..23.1005G. doi:10.1029/2008GB003349.
- CARBOOCEAN IP (website) and C02 in the oceans (movie clip, 55 minutes)
- Buesseler, Ken O.; et al. (2007-04-27). "Revisiting Carbon Flux Through the Ocean's Twilight Zone" (abstract). Science. 316 (5824): 567–70. Bibcode:2007Sci...316..567B. doi:10.1126/science.1137959. PMID 17463282. Retrieved 2007-11-16.
- Nellemann, C.; Corcoran, E.; Duarte, C. M.; Valdés, L.; De Young, C.; Fonseca, L.; Grimsditch, G. (2009). "Blue Carbon. A Rapid Response Assessment". GRID-Arendal. United Nations Environment Programme.
- Lafoley, D.d’A. & Grimsditch, G. (2009). "The management of natural coastal carbon sinks" (PDF). Gland, Switzerland: IUCN.
- Wilson, R.W.; et al. (2009). "Contribution of Fish to the Marine Inorganic Carbon Cycle". Science. 323 (5912): 359–62. Bibcode:2009Sci...323..359W. doi:10.1126/science.1157972. PMID 19150840.
- Scorse, J. (2010). What environmentalists need to know about economics. (pp. 145-152). New York, NY: Palgrave Macmillan.
- Brander Keith (2010). "Impacts of climate change on fisheries" (PDF). Journal of Marine Systems. 79: 389–402. Bibcode:2010JMS....79..389B. doi:10.1016/j.jmarsys.2008.12.015.
- FAO (2009) Climate change implications for fisheries and aquaculture. Overview of current scientific knowledge[permanent dead link] Fisheries and Aquaculture Technical Paper 530, Rome.
- Klyashtorin LB (2001) Climate change and long-term fluctuations of commercial catches: the possibility of forecasting Technical paper 410, FAO fisheries, Rome. ISBN 978-92-5-104695-1.
- Bahri, Tarûb and Cochrane, Kevern (2011) "Climate change impacts on the world fisheries resources" In: Review of the state of world marine fishery resources, pages 279–290, FAO Fisheries technical paper 569, FAO, Rome. ISBN 978-92-5-107023-9.
- Bakun A (1997) "Global synchrony in fish population variations" In: Review of the state of world marine fishery resources, pages, FAO Fisheries Circular 920, FAO, Rome.
- Csirke, Jorge and Vasconcellos, Marcelo (1995) "Fisheries and long-term climate variability" In: Review of the state of world marine fishery resources, FAO Fisheries technical paper 457, FAO, Rome. ISBN 92-5-105267-0.
- Powell AM and Xu J (2012) "The 1977 Global Regime Shift: A Discussion of Its Dynamics and Impacts in the Eastern Pacific Ecosystem" Atmosphere-Ocean, 50 (4): 421–436. doi:10.1080/07055900.2012.716023