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Statistical and Monte Carlo analysis of the Hawaii deep-set longline fishery with emphasis on take and mortality of Oceanic Whitetip Shark
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2021
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Series: PIFSC data report ; DR-21-006
[PDF-1.18 MB]
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Description:The study developed a process model from pelagic observer data to describe the take and mortality of oceanic whitetip shark (OCS) in the Hawaii deep-set longline fishery. The process model considered the: 1) probability of interaction (Catch model #1); 2) probability of branchline bite-off (Catch model #2); 3) probability of mortality at retrieval (Fate model #1); 4) probability of mortality due to handling between retrieval and release (Fate model #2); and 5) probability of post-release mortality and mortality of bite-off (Fate model #3). Three scenarios were considered for the OCS process models: 1) the current fishery use of using wire leaders and leaving ~10 m of trailing gear on a released shark (Scenario 1-Status quo); 2) intended use of monofilament, removing all trailing gear (0 m) on a released shark (Scenario 2-Monofilament leaders); and 3) intended use of monofilament, removing all trailing gear (0 m) on a released shark and gear modification by eliminating three hooks adjacent to longline floats (Scenario 3-Monofilament leaders and gear modification). Monte Carlo simulations were conducted for each of the three scenarios.
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Rights Information:Public Domain
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Compliance:Submitted
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