长臀鮠繁殖生物学初步研究

Preliminary Studies on Reproduction Biology of Helmet Catfish (Cranoglanis bouderius)

报道了长臀鮠繁殖生物学的初步调查研究,其结果包括形态特征,成熟规格(雌性成熟规格为660g;雄性成熟规格为400g),雌雄鉴别在非繁殖期在外形上雌雄难以辨别,在繁殖期雌雄最明显的区别是泄殖孔的形状和颜色,繁殖期雌性个体轻挤腹部时有卵粒流出。雌雄性别比例在1∶1左右。个体繁殖力(Y)与体长(L)和体重(W)的关系分别为Y=-18034.8+1084.58L、Y=3711.26+18.02W。

The investigation data of reproduction biology of helmet catfish Cranoglanis bouderius in Songtao Reservoir is introduced including normal biology and maturity size with 660 g for males and 400 g for females. During the reproduction season, the most prominent identification between males and females is the shape and eolour of genital pores.Moreover,the gentle pressure on the abdomen will cause the flow of roes from gentle pore.The sex ratio is 1：1 approximately.The relationships between individual fecundity （Y） and length （L） as well as weight （W） are Y=-18034.8＋1084.58L and Y=3711.26＋18.02 W.