北部湾短尾大眼鲷群体结构及生长、死亡和性成熟参数估计

doi:10.11978/2015153

Abstract

Abstract: The fisheries biology characters of Priacanthus macracanthus, including size composition, sex ratio, gonad maturity, diet, and parameters for its growth, mortality and maturity, were analyzed based on the data collected during 1997-1999 and 2011-2015. Results showed that the dominant body length groups were 110~170 mm during 1997-1999, and 90~150 mm during 2011-2015. The ratios of females to males were higher during 2011-2015 than 1997-1999, except in autumn. The ratios also varied with body length. During 1997-1999, it decreased first and then increased. During 2011-2015, it decreased first, then increased, and again decreased. The estimated first maturity lengths (L₅₀) were 175 and 170 mm for 1997-1999 and 2011-2015, respectively. The average feeding intensity was greater during 2011-2015 than during 1997-1999. It may be attributed to less food competition because of the continuous overfishing and decline of fish abundance. The estimated asymptotic length (L_?) and growth parameter (K) calculated by Electronic Length Frequency Analysis I (ELEFANⅠ) were 291 mm and 0.70 a^-1, respectively. The estimated total mortality coefficient (Z) and natural mortality coefficient (M) were 4.57 and 1.38, respectively. The exploitation rate of 0.70 indicated this stock was still over-exploited.

Key words: Priacanthus macracanthus, population structure, biological parameters, Beibu Gulf

ZHANG Kui, CHEN Zuozhi, WANG Yuezhong, SUN Dianrong, QIU Yongsong. Population structure of Priacanthus macracanthus in the Beibu Gulf, and parameters for its growth, mortality and maturity[J].Journal of Tropical Oceanography, 2016, 35(5): 20-28.

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Population structure of Priacanthus macracanthus in the Beibu Gulf, and parameters for its growth, mortality and maturity

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