Gonadal Sex Differentiation of Red Sea Bream of a Selected Strain
Gonadal Sex Differentiation of Red Sea Bream of a Selected Strain
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所选品系红鲷的性腺性别分化
DOI：
10.11233/aquaculturesci1953.47.29
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
H. Kumai
中科院分区：
文献类型：
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作者：
Keitaro Kato;R. Hayashi;Yutaka Ishitani;Shinji Yamamoto;S. Miyashita;O. Murata;H. Kumai
以实验室饲养的真鲷为材料，对真鲷性腺的性别分化过程进行了组织学研究。在所有的鱼年龄3和4个月的性腺中观察到中央腔。40尾7月龄鱼中有34尾的性腺出现了笔核仁期卵母细胞。从孵化后8个月到12个月，大约一半的鱼有两性性腺。1龄至1岁4个月龄鱼的性腺为卵巢或两性性腺，而9月以后的1龄鱼和2龄鱼的性腺为卵巢、两性性腺或睾丸。在3龄鱼中没有发现两性生殖腺。因此，该品系性腺的性别分化模式可概括如下。卵巢的分化在所有鱼类中进行，直到孵化后7个月。然后，一半的鱼继续发育卵巢，而另一半则开始发育睾丸，直到1至2岁。
The process of gonadal sex differentiation of red sea bream, Pagrus major, of a selected strain was histologically studied using fish reared in the laboratory. Central cavities were observed in gonads in all of the fish aged 3 and 4 months. The gonads in 34 of 40 fish aged 7 months had oocytes at the pen-nucleolus stage. From 8 months to 12 months after hatching, about half of the fish had bisexual gonads. Gonads of fish from 1 year to 1 year and 4 months old were ovaries or bisexual gonads, while those of the 1-year-old fish after September and 2-year-old fish were ovaries, bisexual gonads or testes. Bisexual gonads were not seen in 3-year-old fish. Therefore, the pattern of gonadal sex differentiation in this selected strain may be summarized as follows. Differentiation to ovaries progresses in all fish until 7 months after hatching. Then half of fish continues to develop their ovaries, while the rest half starts to develop testis instead until 1 to 2 years old.