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Trap-weight influence on catches of Hawaiian Spiny lobster (Panulirus marginatus) and scaly slipper lobster (Scyllarides squammosus) from the northwestern Hawaiian Islands
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    "Spiny lobster (Panulirus marginatus) and slipper lobster (Scyllarides squammosus) were exploited by a commercial trap fishery in the Northwestern Hawaiian Islands (NWHI) from the mid-1970s to 1999. Since 1976, the National Marine Fisheries Service (NMFS) has been conducting lobster research surveys in the NWHI with the mean catch of lobsters per trap and the size composition of lobsters used to compute annual indices of recruitment. A critical assumption made in computing the recruitment indices is that lobster catchability remains constant. This assumption was potentially violated by the use of different weights of lobster traps in the surveys. The varying trap weights may have affected catchability due to trap movement, for lighter traps tend to move more readily, especially in rough weather, than heavier traps. Given a certain density of lobsters at a survey station a stationary trap will catch more lobsters than a trap moving on the seafloor. Because of these concerns and their effect on recruitment indices, the NMFS initiated a study to determine the effects of trap weight on P. marginatus and S. squammosus catch rates"--Abstract.
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