All posts filed under “Fisheries

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The State Of Tunafish

Last December, the United Nations declared the 2nd of May ‘World Tuna Day’, to raise awareness for the overwhelming demand on tuna. In the latest edition of The State World Fisheries and Aquaculture, the UN Food and Agriculture Organization (FAO) noted that there is a need for effective management to restore the overfished stocks including tuna. The International Seafood Sustainability Foundation (ISS) has an interesting interactive tool on their website, which shows the stock health per tuna species, and per area of catch. Whereas it also shows how each species is caught. For instance, it can be concluded that albacores are the most sustainably fished tuna species, since most of them are caught by pole and line. This type of gear prevents bycatch, in which other fish/sea creatures are ‘collateral damage’, caught in the same net as the tuna. On the other end of the spectrum is the skipjack, which is caught the least sustainable, with purse seines and gillnets. Skipjacks are most commonly used for canned tuna. (source)

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Overfishing in the Mekong

In the just published report ‘From Sea to Source 2.0’, on the migration of fish, we come across this graph. It shows the consequences of overfishing of the giant catfish in the Mekong, based on a study in BioScience by J.D. Allan. It shows fish catches (yield) as a function of effort for the Mekong giant catfish fishery in Chiang Khong, Thailand. The initial increase in boats employed results in higher yields, but is then followed by a crash of the fish stocks. According to ‘From Sea to Source 2.0’, not only overfishing, but also industrialisation, climate change, water quality deterioration, and other threats have seriously hampered fish migration, that is needed for many fish to to fulfil their entire lifecycle. (source)