长毛对虾、短沟对虾和日本对虾的染色体研究

THE CHROMOSOMES OF THREE SHRIMP PENAEUS PENICILLATUS, P. SEMISULCATUS AND P. JAPONICUS

目前,利用高新技术,如实行生殖和遗传操作进行对虾品种改良的设想正在中国、美国、澳大利亚和日本等国加紧实施,但对虾遗传和生殖学研究尚欠深入,限制了这项研究的进展。其中对虾染色体知识的贫乏和研究技术的短缺就是突出的一例。

The chromosomes of the three shrimp Penaeus penicillatus, P. semisulcatus and P. ja-ponicus were studied. The specimens were collected from the coastal areas nearby Xiamen in South China. The similar technique reported by Xiang (1988) was used. The chromosomal analyses of the meiotic metaphase from spermatocytes and mitotic metaphase from spermat-ogoniums of mid-gut cells showed that the numbers of chromosome in the three species are P. penicillatus n= 44, 2n = 88; P. semisulcatus n= 45, 2n = 90; P. japonicus n= 43, 2n=86, respectively.