Carlson, John K. and Cortés, Enric and Neer, Julie A. and McCandless, Camilla T. and Beerkircher, Lawrence R.
The Status of the United States Population of Night Shark,
Marine Fisheries Review, 70(1),
Night sharks, Carcharhinus signatus, are an oceanic species generally occurring in outer continental shelf waters in the western North Atlantic Ocean including the Caribbean Sea and Gulf of Mexico. Although not targeted, night sharks
make up a segment of the shark bycatch in the pelagic longline fishery. Historically, night sharks comprised a significant proportion of the artisanal Cuban shark
fishery but today they are rarely caught. Although information from some fisheries has shown a decline in catches of night sharks, it is unclear whether this decline is due to changes in fishing tactics, market, or species identification. Despite the uncertainty in the decline, the night shark is currently listed as a species of concern due
to alleged declines in abundance resulting from fishing effort, i.e. overutilization.
To assess their relevance to the species of concern list, we collated available information on the night shark to provide an analysis of its status. Night shark landings were
likely both over- and under-reported and thus probably did not reflect all commercial and recreational catches, and overall they have limited relevance to the current status
of the species. Average size information has not changed considerably since the 1980’s based on information from the pelagic longline fishery when corrected for gear bias.
Analysis of biological information indicates night sharks have intrinsic rates of increase (r) about 10% yr–1 and have moderate rebound potential and an intermediate generation time compared to other sharks. An analysis of trends in relative abundance from four data sources gave conflicting results, with one series in decline, two series
increasing, and one series relatively flat. Based on the analysis of all currently available information, we believe the night shark does not qualify as a species of concern
but should be retained on the prohibited species list as a precautionary approach to management until a more comprehensive stock assessment can be conducted.
||The Status of the United States Population of Night Shark,
|Carlson, John K.|
|Cortés, Enric |
|Neer, Julie A.|
|McCandless, Camilla T. |
|Beerkircher, Lawrence R. |
|Journal or Publication Title:
||Marine Fisheries Review
||United States National Marine Fisheries Service
Patti M. Marraro
||14 Aug 2012 16:46
||14 Aug 2012 16:47
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