浙江南部近海鳞鳍叫姑鱼和皮氏叫姑鱼的生长、性成熟和死亡特征研究

Growth,maturity and mortality of Johnius distinctus and J.belangerii in offshore waters of southern Zhejiang Province

鳞鳍叫姑鱼(Johnius distinctus)和皮氏叫姑鱼(J.belangerii)是我国东海的小型经济鱼类,且为生态系统中重要的饵料鱼类,研究分析其生物学特征对促进东海生态系统和渔业的科学管理具有重要意义。根据2015年11月至2018年11月浙江南部近海渔业资源季度调查数据,运用线性混合效应模型(Linear mixed effects model,LMEM)研究了这2种叫姑鱼的生长特征及其异质性;通过ELEFAN法估算了2种叫姑鱼的极限体长L_(∞)、趋近极限体长的相对生长速率k、理论生长起始年龄t_(0)、自然死亡系数M、总死亡系数Z、开发率E以及50%性成熟体长。结果表明,季节对2种叫姑鱼体长和体质量关系影响最为显著;鳞鳍叫姑鱼L_(∞)=216.83 mm,k=0.84,t_(0)=−0.18;皮氏叫姑鱼L_(∞)=207.38 mm,k=0.63,t_(0)=−0.25;鳞鳍叫姑鱼Z=3.80,M=1.53,E=0.60;皮氏叫姑鱼Z=1.88,M=1.24,E=0.34;鳞鳍叫姑鱼和皮氏叫姑鱼50%性成熟体长分别为133.1和128.9 mm。

Karut croaker(Johnius distinctus)and Belanger's croaker(J.belangerii)are common small economic fishes and important prey species in the ecosystem of the East China Sea.Studies on their biological characteristics are essential to understand the ecosystem and to improve the scientific management of these important fisheries in the East China Sea.Based on the seasonal surveys of fishery resources in the offshore waters of southern Zhejiang Province,we applied linear mixed effects model(LMEM)to study the growth characteristics and heterogeneity of the two species.The asymptotic body length(L_(∞)),growth rate(k)and theoretical growth starting age(t_(0))were estimated by ELEFAN method.The natural mortality coefficient(M),total mortality coefficient(Z),development rate(E),and the 50%sexual mature body length of the two species were estimated.The LMEM results show that seasons have the most significant effect on their growth.For J.distinctus,L_(∞)=216.83 mm,k=0.84,t_(0)=−0.18;for J.belangerii,L_(∞)=207.38 mm,k=0.63,t_(0)=−0.25.For J.distinctus,Z=3.80,M=1.53,E=0.60;for J.belangerii,Z=1.88,M=1.24,E=0.34.The length of 50%maturity's estimates were 133.1 mm and 128.9 mm for J.distinctus and J.belangerii,respectively.