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A study on the stock assessment and management implications of the hairtail, Trichiurus lepturus Linne in Korean waters: 1. Estimation of population ecological characteristics of the hairtail, Trichiurus lepturus Linne in Korean waters



A study on the stock assessment and management implications of the hairtail, Trichiurus lepturus Linne in Korean waters: 1. Estimation of population ecological characteristics of the hairtail, Trichiurus lepturus Linne in Korean waters



Journal of the Korean Fisheries Society 29(5): 567-577



This study is to estimate population ecological parameters, including growth parameters, survival rates, instantaneous coefficients of natural and fishing mortalities, and age at first capture, as well as growth rates at age of the hairtail, Trichiurus lepturus Linne in Korean waters. For describing the growth of the hairtail, three growth models were fitted, and the von Bertalanffy growth model was adopted for the purpose of the further stock assessment work. The von Bertalanffy growth parameters estimated from a nonlinear regression using EXCEL Solver were L infin =46.01 cm, K=0.3868, and t-0= -0.3220. Annual survival rate (S) of the hairtail was estimated to be 0.277 (variance=0.00035) and the instantaneous coefficient of natural mortality (M) was estimated to be 0.441/year. Instantaneous coefficient of fishing mortality (F) for the recent years was calculated as 0.843/year, implying an impact from fishing about two times greater than that of natural mortality. The age at first capture (t-c) was estimated to be 0.787 years, which is much younger age than 50% mature age. Finally, the growth rates at age were estimated.

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