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Science 15 December 2006:
Vol. 314. no. 5806, p. 1653
DOI: 10.1126/science.314.5806.1653n
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This Week in Science

The status of top predators, such as tuna and shark in ocean fisheries, is controversial, with some reports suggesting biomass declines of as much as 90% as a result of fishing pressure. Sibert et al. (p. 1773) synthesize all available data on eight stocks of large predatory fish in the Pacific Ocean and reached rather different conclusions. The authors place reductions in the biomass of predator species since 1950 to between 9% to 64%, and neither the average size, nor the trophic status of fish in the population has changed. Despite these lower estimates of the effects of fishing pressure, more effective management is still required to ensure that Pacific fisheries are sustainable.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)