眼斑星丽鱼（Astronotus ocellatus）的生物学与核型初步研究

对眼斑星丽鱼(Astronotus ocellatus)的形态特征、生活习性、生长特性、繁殖特性等生物学特性及其核型进行初步研究。结果表明,眼斑星丽鱼对温度适应性广,最低耐受温度为11.4℃;耐盐性试验中,幼鱼组和成鱼组达到盐度32的死亡率分别为23.7%和15.4%。体长和体重的相关关系为:W=0.0911L2.7233(r=0.9612);生长速度快,性成熟年龄为1龄,分批产卵,卵粘性;胚胎发育阶段所需积温为1 466.4℃.h;染色体数目为2n=48,核型公式为4m+20sm+18st+6t,NF=78。

Preliminary study on boilogy habit and karyotype of Astronotus ocellatus

The morphological characteristic,living habit,growth,reproductive and karyotype of Astronotus ocellatus were studied and analyzed.Astronotus ocellatus is carnivores.They were able to adapt to a wide range of temperature,even the lowest was 11.4℃.The saulty experiments showed Astronotus ocellatus lived the sault 32,death rate was 23.7% and 15.4%.The relationship between body length and weight of Astronotus ocellatus can be expressed by the equation: W=0.0911L2.7233(r=0.9612).They reached to their first maturity at 1+,and produced spawns many times in one breeding period.The fertilized eggs were demersal and adhesive.The accumulative temperature in embryo period was 1 466.4℃·h.The number of diploid chromosome is 2n=48 and the karyotype formula is 4m+20sm+18st+6t,NF=78.