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Analysis of sex-specific spawning biomass per recruit of the sailfish (Istiophorus platypterus in the waters off eastern Taiwan
Chiang, W.-C.; Sun, C.-L.; Wang, S.-P.; Yeh, S.-Z.; Chen, Y.; Su, W.-C.; Liu, D.-C.; Chen, W.-Y. (2009). Analysis of sex-specific spawning biomass per recruit of the sailfish (Istiophorus platypterus in the waters off eastern Taiwan. Fish. Bull. 107(3): 265-277
In: Fishery Bulletin. US Government Printing Office: Washington, D.C.. ISSN 0090-0656, more
Peer reviewed article  

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  • Chiang, W.-C.
  • Sun, C.-L.
  • Wang, S.-P.
  • Yeh, S.-Z.
  • Chen, Y.
  • Su, W.-C.
  • Liu, D.-C.
  • Chen, W.-Y.

    Analyses of sex-specific yield per recruit and spawning stock biomass per recruit were conducted to evaluate the current status of the sailfish (Istiophorus platypterus) fishery in the waters off eastern Taiwan. Natural mortality rates estimated from Pauly’s empirical equation were 0.26 /yr for females and 0.27/yr for males. The current fishing mortality rates were estimated as 0.24/yr and 0.43/yr for females and males, respectively, which are much lower than the estimated F0 .1 (0.62 /y r and 0.79/yr for females and males, respectively) and FSSB40 (0.46/yr for females) which are commonly used as target reference points in fisheries management. The effects of the fishing mortality, natural mortality, and age at first capture on the estimates of biological reference points were evaluated by using the Monte Carlo simulation. The results indicate that failure to consider the uncertainty in parameters such as natural mortality or age at first capture may lead to the improper estimation of biologicalreference points. This study indicates the possibility of current fishing mortality exceeding the target biologicalreference points may be negligible for sailfish in the waters off eastern Taiwan. However, in view of therecent rapid increase in fishing effort, it is evident that the stock status and development of the fishery need to be closely monitored.

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