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Regulatory Amendment 21 to the fishery management plan for the snapper grouper fishery of the South Atlantic region : minimum stock size threshold (MSST) for snapper grouper stocks with low natural mortality
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2013
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[PDF-3.94 MB]
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Alternative Title:Fishery Management Plan for the Snapper Grouper Fishery of the South Atlantic Region;South Atlantic snapper grouper, Amendment 21;
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Description:"Regulatory Amendment 21 redefines the overfished threshold for red snapper, blueline tilefish, gag, black grouper, yellowtail snapper, vermilion snapper, red porgy, and greater amberjack. The current definition of the minimum stock size threshold (MSST) for these species, which is used to determine if a species is overfished, is a function of the natural mortality rate (M). MSST equals SSBMSY*(1-M or 0.5, whichever is greater), where SSBMSY is the biomass when the stock is at the maximum sustainable yield (MSY) level and considered to be rebuilt. When the natural mortality rate is small (less than 0.25) there is little difference between the threshold for determining when a stock is overfished (MSST) and when the stock is rebuilt (SSBMSY). Thus, for species that have a low rate of natural mortality, even small fluctuations in biomass due to natural conditions rather than fishing mortality may cause a stock to be classified as overfished. Regulatory Amendment 21 redefines MSST for the species listed above as 75% of SSBMSY, which is expected to help prevent overfished designations when small drops in biomass are due to natural variation in recruitment or other environmental variables such as extreme water temperatures, and ensure that rebuilding plans are applied to stocks when truly appropriate"--Cover letter summary.
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Rights Information:Public Domain
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Compliance:Submitted
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