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Revised estimates of bluefin tuna dead discards by the U.S. Atlantic pelagic longline fleet, 1992-1999


Revised estimates of bluefin tuna dead discards by the U.S. Atlantic pelagic longline fleet, 1992-1999



International Commission for the Conservation of Atlantic Tunas Collective Volume of Scientific Papers 52: 1007-1021



Estimates of the dead discards of bluefin tuna (Thunnus thynnus) by the US Atlantic pelagic longline fleet permitted to land and sell Atlantic swordfish (Xphias gladius) are based on logbook reported fishing effort levels and scientific observer records of catch rates from a representative sample of the fleet. Estimates are constructed using the Delta-lognormal method as described by Pennington (1983), taking into account possible geographical and time of year effects, and coefficients of variation are calculated. The estimates ignore information that may be available in self-reported data on catch rates of bluefin tuna. Catch rate samples are pooled as necessary across strata to achieve a minimum sample size of 30 observations. The estimates of bluefin tuna dead discards are compared to previous estimates and are converted to weight.

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