乐山棒花鱼形态特征的两性异形和雌性个体生育力

测定了乐山棒花鱼(Abbottina kiatingensis)繁殖期形态特征包括体长、头长、头宽、头高、吻长、眼后头长、眼径、眼间距、体高、尾柄长、尾柄高、尾鳍长、背鳍基前距、背鳍基长、腹鳍基前距、腹臀间距、体重和去内脏体重的两性异形和雌性个体生育力.繁殖期雄性个体的数量显著多于雌性个体,雌雄两性个体的体长差异不显著.特定体长的雌性个体的头长、头宽、头高、吻长、眼后头长、尾柄高、背鳍基前距、背鳍基长和去内脏体重显著小于雄性个体,其余指标不存在明显的差异.回归分析表明,乐山棒花鱼的怀卵数量与体长和体重回归关系显著,雌性通过个体大小(体长和体重)的增加来提高个体生育力.

Sexual Dimorphism in Morphological Traits and Female Individual Fecundity of Abbottina kiatingensis

We measured the sexual dimorphism in morphological traits, including the body length, head length, head width, head depth, snout length, postorbital head length, eye diameter, interorbital width, body depth, caudal peduncle length, caudal peduncle depth, caudal fin length, dorsal fin precoxal length, dorsal fin coxal length, pelvic fin precoxal length, length between pelvic fin and anal fin, body mass, carcass mass of Abbottina kiatingensis from Oujiang river, Lishui City, Zhejiang Province in reproductive season. Our results showed that the number of adult males was larger than that of females and there was no sexual dimorphism in the body length. The females with special body length were significantly shorter than the males in head length,head width, head depth, snout length, postorbital head length, caudal peduncle depth, dorsal fin precoxal length, dorsal fin coxal length and carcass mass. There was no significant sexual difference among other morphological traits. The individual fecundity was positively correlated with the body length and body mass in A. kiatingensis. A conclusion has been drawn that adult females increased the individual fecundity through increasing the individual size (body length and body mass).