淀山湖翘嘴鲌繁殖力研究

为对淀山湖翘嘴鲌Culter alburnus种群数量变动、资源保护提供基础资料,对淀山湖翘嘴鲌个体繁殖力进行了研究。结果表明:调查样本个体繁殖年龄由3~6龄构成,个体绝对繁殖力为22 764~737 760粒,平均为134 901粒;体长相对繁殖力为820~13 982粒/cm,平均为3157粒/cm;体质量相对繁殖力为104~554粒/g,平均为234粒/g;个体绝对繁殖力、体长相对繁殖力与体长和体质量均呈幂函数关系,而体质量相对繁殖力仅与性腺成熟系数和卵巢质量相关。研究表明:淀山湖翘嘴鲌个体绝对繁殖力与体长、卵巢质量、性腺成熟系数和净体质量均呈正相关;体长相对繁殖力与卵巢质量、性腺成熟系数、净体质量和肥满度均呈正相关,与年龄呈负相关;体质量相对繁殖力与性腺成熟系数呈正相关,与卵巢质量呈负相关。

Individual fecundity of culter Culter alburnus in Dianshan Lake

The individual fecundity of culter Culter alburnus in Dianshan Lake was studied to understand the varia-tion in population structure and resource protection of culter, and to provide the basic data for ecological restoration and rational utilization of natural fish stocks in Dianshan Lake. The results showed that the culter began to spawn at age from 3 to 6 years old, and had average individual absolute fecundity of 134901 eggs, ranging from 22764 to 737760 eggs, and the individual relative fecundity of 3157 eggs/cm in body length, ranging from 820 to 13982 eggs/cm, and relative fecundity of 234 eggs/g in body weight, ranging from 104 to 554 eggs/g. The individual ab-solute fecundity and individual relative fecundity in body length was exponentially correlated with body length and body weight, and the relative fecundity in body weight was correlated with only gonado-somatic index ( SGI) and o-vary weight. Multi-regressive analyses revealed that the individual absolute fecundity was positively correlative with body length, ovary weight, SGI and gutted body weight, that the individual relative fecundity of body length was positive correlative to ovary weight, gutted body weight and condition factor, that the individual relative fecundity in body length was negatively correlated to age, and that the relative fecundity in body weight was positively correlated to SGI, and negatively correlated to ovary weight.