Abstract：In order to understand the individual fecundity of loach Barbatula nuda in Liaoning Province, the individual fecundity of loach was compared in 180 female loach with ovary at stage Ⅳ collected by traps with 0.5 cm mesh from Biliu River (E 122.51°, N 39.78°), Yalu River (E 123.72°, N 40.71°)and Liao River(E 123.34°, N 41.09°) by conventional biological method. The results showed that the loach had absolute fecundity of (6999.33±315.19) eggs, relative body length fecundity of of (85.06±2.98) eggs/mm and relative body weight fecundity of (1536.58±60.23) eggs/g. There were significantly higher relative fecundity of body length and body weight in Wanfu section of Biliu River than those in the other two river system (P<0.05). Most of the best fitting equations between individual fecundity and biological indices were found to be quadratic functions. The absolute fecundity and the relative fecundity in body length in the three river systems were significantly correlated with body length, body weight, net body weight, gonad weight and gonado-somatic index (P<0.01), and the relative fecundity of body weight was only significantly correlated with gonado-somatic index in Wanfu section of Biliu River and Tanghe section of Taizi River (P<0.01). A multiple stepwise regression analysis showed that the individual fecundity in Wanfu section of Biliu River and Tanghe section of Taizi River was closely related to gonad weight and gonado-somatic index, and significantly affected by net body weight and relative condition factor in Dapu section of Aihe River. The distribution of egg diameter showed that loach was a once spawning species a year. The finding further enriched the biological research data of B. nuda and provided basic data for its resource protection and sustainable utilization.
吴晨, 骆小年, 段友健, 李姣, 季辰跃, 邢雨忻, 陈隆, 杨艳雨. 辽宁3个水系北方须鳅个体繁殖力比较研究[J]. 水产科学, 2024, 43(2): 215-224.
WU Chen, LUO Xiaonian, DUAN Youjian, LI Jiao, JI Chenyue, XING Yuxin, CHEN Long, YANG Yanyu. Comparison of Individual Fecundity of Loach Barbatula nuda among Three River Systems in Liaoning Province. Fisheries Science, 2024, 43(2): 215-224.
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2024, Vol. 43 
