期刊
FISHERIES RESEARCH
卷 208, 期 -, 页码 219-228出版社
ELSEVIER
DOI: 10.1016/j.fishres.2018.07.011
关键词
Seriola; Greater amberjack; Sex ratio; Population dynamics
类别
资金
- NOAA Fisheries Cooperative Research Program [NA07NMF4540076]
- CRP
- Program of Fisheries and Aquatic Sciences in the School of Forest Resources and Conservation, Institute of Food and Agricultural Sciences, University of Florida
The US Gulf of Mexico stock assessment of greater amberjack Serbia dumerili assumes a 1:1 male:female sex ratio. However, the observed sex ratio in the landed catch is 1:1.8, and for fish > 1 m fork length is 1:2.4. To theoretically explore whether this female-skewed sex ratio may arise due to differential fishing mortality between the sexes, we used a sex-specific age- and size-based model to investigate how different fishing mortality rates could create a female-skew in the landed catch as well as its subsequent effects on reproductive potential. When fishing mortality rates in the model were equal between the sexes, the sex ratio of the landed catch was approximately 1:1 for all legal-sized fish, and approximately 1:2.4 for fish > 1 m FL. However, reproductive potential decreased in comparison to the corresponding scenario with equal fishing mortality rates when fishing mortality rates between the sexes were changed to create the 1:1.8 sex ratio observed in the landed catch. This modeling study demonstrates one possible route that could explain the female-skewed sex ratios observed in the landed catch, and indicates that sex ratio values other than 1:1 should be considered in future stock assessments for Gulf of Mexico greater amberjack.
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