Trevor Branch and Ray Hilborn, with some colleagues, have published a paper in Conservation Biology contrasting global trends in marine fishery status obtained from catches and from stock assessments (here).On the basis of catch trends, it has been suggested that about 70% of all stocks are overexploited due to unsustainable harvesting and 30% of all stocks have collapsed to <10% of unfished levels. In Branch et al (2011)'s comparison of biomass data with catch trends, catch trends overestimated the percentage of overexploited and collapsed stocks. Although their biomass data were primarily from industrial fisheries in developed countries, the status of these stocks estimated from catch data was similar to the status of stocks in the rest of the world estimated from catch data. They  concluded that at present 28–33% of all stocks are overexploited and 7–13% of all stocks are collapsed. Additionally, the proportion of fished stocks that are overexploited or collapsed has been fairly stable in recent years.

TAGS: fisheries, sustainable, overfishing, overexploitation, fishery trends, marine fishery trends, Trevor Branch, Ray Hilborn

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