中华沙鳅个体生殖力研究

为了研究中华沙鳅(Botia superciliaris)个体生殖力及其与多项生物学指标的关系,2009年5～9月从沱江资中段和长江宜宾一南溪段分别收集性腺Ⅳ期中华沙鳅雌鱼32尾和22尾进行研究.结果如下:①沱江资中段中华沙鳅产卵群体由2、3龄鱼组成;绝对生殖力(F)为 560～4 401粒,平均1 915粒,体长相对生殖力(FL)为63～458粒/cm,平均217粒/cm,体重相对生殖力(FW)为39～424粒/g,平均230粒/g；绝对生殖力、体长相对生殖力与体长、体重、净体重和成熟系数相关性极显著,体重相对生殖力与体重和成熟系数相关性显著,个体生殖力与肥满度相关性不显著.②长江宜宾一南溪段产卵群体由2、3、4龄鱼组成；绝对生殖力(F)为1 593～14 892粒,平均4 991粒,体长相对生殖力(FL)为168～1 568粒/cm,平均509粒/cm,体重相对生殖力(FW)为49～294粒/g,平均123粒/g;绝对生殖力、体长相对生殖力和体重相对生殖力与体重、净体重、成熟系数和肥满度相关性极显著,与体长和年龄相关性不显著.研究结果表明沱江资中段中华沙鳅繁殖群体低龄化、小型化,建议加强其资源保护.

Study on Individual Fecundity of Botia superciliaris

In order to study the individual fertility of Botia superciliaris and its relationship with multiple biological indexes,32 and 22 adult female specimens were collected from Tuo river and Yangtze river respectively from May to September in 2009 and studied.The results were as follows.Spawning stock of B.superciliaris in Tuo river was composed of 2 or 3-year-old fish.Its absolute fertility(F) was 560～4 401 eggs,with an average of 1 915 eggs.Length relative fertility(FL) was 63～ 458 eggs/cm with an average of 217 eggs/cm.Weight relative fertility(FW) was 39～424 eggs/g with an average of 230 eggs/g.Absolute fertility and length relative fertility were significantly correlated to body length(L),body weight(M),net body weight(W) and coefficient of maturing(GSI);and weight relative fertility was significantly correlated to W and GSI;while,they all had no obvious relationship with fullness(K).In Yangtze river,spawning stock of B.superciliaris was composed of 2,3 or 4-year-old fish.F was 1 593～14 892 eggs with an average of 4 991 eggs.FL was 168～1 568 eggs/cm with an average of 509 eggs/cm.FW was 49～294 eggs/g with an average of 123 eggs/g.F,FL and FW were significantly correlated to M,W,GSI and K,but not significantly correlated to L and age.B.superciliaris population in Tuo river was with lowering trend of ages and miniaturization,thus was needed to be protected.