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|Title: ||Stock assessment of swordfish ( Xiphias gladius ) in the Indian Ocean using age-structured integrated analysis.|
|Authors: ||Sheng-Ping Wang;Tom Nishida|
|Issue Date: ||2017-03-09T01:59:55Z
|Publisher: ||The Twelfth Session of the IOTC Working Party on Billfish, Indian Ocean Tuna Commission (IOTC),|
|Abstract: ||ABSTRACT:This study evaluated the stock status of swordfish in the Indian Ocean based on
the sex-specific age-structured integrated approach (ASIA). Nine scenarios were
conducted based on the different assumptions related to incorporation of CPUE data
and pre-specific biological parameters. For all scenarios, the model generally fits to
the observed length frequency data well for all fleets, while the model cannot fit to
CPUEs very well for some of fleets in years before early-1990s, especially for
JPLL-SW and TWLL-SW because these CPUEs changed sharply since the mid of
1990s but catchabilities were assumed to be constant over time for each fleet. For
whole Indian Ocean, the results of most scenarios indicated that the current fishing
intensity was lower than MSY level and the current spawning biomass was higher
than MSY level, while the current fishing intensity may slightly higher than MSY
level when lower reproductivity was assumed for swordfish. For southwest Indian
Ocean, the results of all scenarios indicated that the current fishing intensity was
lower than MSY level and the current spawning biomass was higher than MSY level.
Base on the results of this study, the status of swordfish in the Indian Ocean and in
the southwestern Indian Ocean might not be overfishing or overfished.
|Appears in Collections:||[環境生物與漁業科學學系] 演講及研討會|
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