Tag: overfishing

New Study Quantifies Expansion of Fisheries

While it is widely-recognized that fishing boats have moved further offshore and deeper in the hunt for seafood, the Sea Around Us Project, in collaboration with the National Geographic Society, recently published in PloS ONE the first study to quantify global fisheries expansion.

The study reveals that fisheries expanded at a rate of one million sq. kilometres per year from the 1950s to the end of the 1970s. The rate of expansion more than tripled in the 1980s and early 1990s – to roughly the size of Brazil’s Amazon rain forest every year.

Between 1950 and 2005, the spatial expansion of fisheries started from the coastal waters off the North Atlantic and Northwest Pacific, reached into the high seas and southward into the Southern Hemisphere at a rate of almost one degree latitude per year. It was accompanied by a nearly five-fold increase in catch, from 19 million tonnes in 1950, to a peak of 90 million tonnes in the late 1980s, and dropping to 87 million tonnes in 2005. Now we have run out of room to expand fisheries.

The image here (click to enlarge) shows a time series of areas exploited by marine fisheries by latitude class, expressed as a percentage of the total ocean area.

Daniel Pauly Delivers Keynote at Seafood Summit

Daniel Pauly recently gave the keynote address at the 2010 Seafood Summit in Paris. His talk compared industrial fishing to a Ponzi scheme, where instead of extracting a sustainable interest from invested capital, we use up the capital itself, and hope for other ‘investors’. He discussed the three-way expansion of fishing through the 20th century: geographically, by fishing in distant waters and getting access to African, Caribbean and Pacific waters; by fishing in deeper and deeper waters; and a taxonomic expansion. Pauly then addressed aquaculture and its limitations, particularly the double accounting of carnivorous farmed fish. He finished by talking about conservation efforts and the need to include the small-scale fisheries in the developing world in conservation efforts. His full talk is available through the Seafood Summit website.

High Seas Fleet Kept Afloat with Subsidies

The Belise-registered deep sea trawler Chang Xing trawling in in High seas bottom trawlers catch some of the tastiest fish (think Orange roughy, rockfish, and Patagonian toothfish), which are also some of the most vulnerable and overfished species because they grow and mature so slowly. A new study shows that this type of overfishing continues because the  200-strong trawling fleet is kept afloat with government money.

Several members of the Sea Around Us Project led by fisheries economist Rashid Sumaila estimated bottom trawl fleets operating in the high seas, i.e., outside of the Exclusive Economic Zones of maritime countries, receive an estimated US$152 million per year in fisheries subsides, which is 25% of the total landed value of the fish. The profit achieved by this vessel group is normally not more than 10% of landed value, which means that without subsidies, the bulk of the world’s bottom trawl fleet operating in the high seas will be operating at a loss, and unable to fish, thereby reducing the current threat to deep-sea and high seas fish stocks. The study is titled Subsidies to high seas bottom trawl fleets and the sustainability of deep-sea demersal fish stocks and was published online this month in the journal Marine Policy.

Consumer Campaigns, Pig Feed, and Conservation

wholefoodsAn article titled Conserving wild fish in a sea of market-based efforts appeared last week in Oryx: The International Journal of Conservation authored by Jennifer Jacquet, Daniel Pauly, Rashid Sumaila, and Sherman Lai of the Sea Around Us Project, along with five additional colleagues. Its publication led to an article in the Vancouver Sun on how domestic farm animals are devouring the world’s fish stocks and an AFP piece explaining that consumer campaigns don’t save endangered fish.  The article addresses the effects of consumer campaigns in an increasingly globalized market for seafood.