兴淮鲫（白鲫♀±散鳞镜鲤♂）性腺发育的研究

兴淮鲫的性腺发生和发育状况比较特殊，大致有下列类型；（１）无性腺个体，占解剖总数的１９．６％；（２）两性嵌合型个体，其性腺以卵巢为主，精巢为辅，占解剖总数的２．４５％；（３）卵巢发育不正常个体，占解剖总数的１９％；（４）卵巢发育正常个体，占解剖总数的１２．８％；（５）精巢发育异常个体，占解剖总数的１５．３％；（６）精巢发育正常个体，占解剖总数的３０．６％。总之，兴淮鲫的大多数个体性腺发育不正常，只有部分雌性和雄性个体的性腺发育是正常或比较正常的。但精巢内的精子是否具有受精能力尚待进一步研究。

Studies on the gonadal development of the Xinghuai hybrid crucian carp

The gonadal development of Xinghuai hybrid crucian carp was studied inthis paper with the cytologic technology. The obtained results showed that the gonadaldevelopment condition of Xinghuai hybrid crucian carp was very special and could be dividedinto several development types as followed: (1) The individual without gonad was about1 9. 6 % of total dissected population. For these individual the gonad could not be found afterdissecting. (2 )The hermaphroditic masias, in which the gonad was consisted of ovary mainly,was 2. 45 % of dissected pbpulation contained the gonad. (3 ) The ovary if individuals couldnot develop normally. Even if individuals over two winters,the ovary could only develop tophage I and the oogonia in ovary were fail of develop and resorbed gradully. The oogoniaappeared in follicular. This type of individual was about 59. 6% of the females. (4) Theindividual whose ova.ry could develop to phage IV-V and the oocytes in different phageswere normal was about 40. 4% of total females. (5 )The tests could develop to stage 1 andI. After that,tests stopped to developed and degenerated. This kind of individual was about33. 3% of total males. (6) The tests and spermatoons of different stages in testes coulddevelop normally. The test of stage V was full of normal sperma. Thus the most ofindividuals of Xinghuai F, Hybrid carassius are sterile. In addition,part of female and maleare tertile. Whether the sperma of fertile males own the fertilization still depends on furtherresearches.