| 黄颡鱼性腺分化及温度对性别分化的影响 |
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| 引用本文： | 游鑫,邓闵,刘全圣,覃雅,何绪刚.黄颡鱼性腺分化及温度对性别分化的影响[J].华中农业大学学报,2016,35(1):106-113. |
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| 作者姓名： | 游鑫 邓闵 刘全圣 覃雅 何绪刚 |
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| 作者单位： | 1. 华中农业大学水产学院，武汉 430070; 淡水水产健康养殖湖北省协同创新中心，武汉 430070;2. 华中农业大学水产学院,武汉,430070 |
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| 基金项目： | 国家科技支撑计划项目（2012BAD25B06）；公益性行业（农业）科研专项（201203083-05） |
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| 摘 要： | 采用组织切片法研究黄颡鱼的性腺分化并观察温度对性别分化的影响。结果发现,(27±1)℃(中温组)条件下,15日龄(全长(13.99±0.24)mm)黄颡鱼性腺开始分化,具有裂隙(即卵巢腔)的原始性腺未来发育为卵巢,而不具裂隙的原始性腺未来发育为精巢;精小叶和输精管最早出现于60日龄(全长(47.58±1.74)mm),雌性生殖细胞的发育及分化显著早于雄性。(32±1)℃条件下(高温组)仔鱼性腺分化比中温组早5~10d,(22±1)℃(低温组)仔鱼发育缓慢,性腺分化比中温组晚25~30d。中温组和低温组幼鱼雌雄比接近1∶1(分别为1∶0.96和1∶1.17);高温组幼鱼雌雄比例为1∶2.09,雄性率为(67.70±0.54)%。高温条件((32±1)℃)使性腺发育趋向雄性。
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| 关 键 词： | 黄颡鱼 性腺分化 温度 性比 |
Gonadal differentiation and effects of temperature on sex determination in yellow catfish,Pseudobagrus fulvidraco Richardson |
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| Abstract: | Gonadal differentiation of yellow catfish (P seudobagrus fulvidraco Richardson)under different water temperatures was investigated by histological sectioning,and the effects of different tem-peratures on sex determination were studied.The results showed that the histological differentiation of yellow catfish occurred firstly at 15 days post hatching (dph)under (27±1)℃.There were two types of primordial gonad and one with cavity will develop into ovary,and the other one without cavity will devel-op into testis.Ovarian cavity firstly appeared at 15 dpt (the total length reached 13.99 ±0.24 mm)and the occurrence of spermaduct and seminiferous lobule began at 60 dpt (the total length reached 47.58± 1.74 mm).This experiment showed that germ cell division in the female was earlier than that in the male.Gonads of the larva reared under higher water temperature (32 ± 1 )℃ differentiated about 5-10 days earlier than those under moderate temperature (27±1)℃.Gonads under lower water temperature (32±1)℃ differentiated about 25-30 days later than the larva under moderate temperature (27±1)℃. The sex ratio under moderate or lower water temperature was close to 1 ∶1 (1 ∶0.96 and 1 ∶1.17 re-spectively).However,the sex ratio under higher water temperature was 1:2.10,and the proportion of males were 67.70%±0.54% (P <0.05).This result suggested that temperature can influence gonad dif-ferentiation of P .fulvidraco and higher water temperature (32±1)℃ can induce masculination. |
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| Keywords: | P seudobagrus fulvidraco Richardson gonadal differentiation temperature sex ratio |
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