Singh Ram, Chaturvedi S K
Department of Zoology, Satish Chandra P.G. College, Ballia 277 001, India.
J Environ Biol. 2010 May;31(3):307-10.
In Channa punctatus testicular regression commonly observed during spawning and postspawing phases of reproductive cycle. In the present study testicular regression was frequently noticed in fish maintained under both long photoperiod-warm temperature (LD 16 : 8-30 degrees C) and short photoperiod-warm temperature (LD 8 : 16-30 degrees C) regimes. Testicular regression was characterized by distortion of cellular boundary of lobules and formation of collagenous capsules containing degenerating germ cells, blood cells and colloidal mass within the lobules. The magnitude of testicular regression was more in fish exposed to short photoperiod regime (R-73.33%, SP-41.67%) than long photoperiod regime (R-50.83%, SP-19.16%) and control group (R-20.83%, SP-16.67%) in both resting (R) and spawning (SP) phases. Further the frequency of testicular regression during resting phase was 73.33% (short photoperiod), 50.83% (long photoperiod) and 20.83% (control) whereas during spawning phase was 41.67% (short photoperiod) 19.16% (long photoperiod) and 16.67% (control). In the present study occurrence of more testicular regression during resting phase than spawning phase may be due to change in the endogenous condition of the fish.
在斑鳢中，睾丸退化常见于生殖周期的产卵期和产后阶段。在本研究中，在长光照周期-温暖温度（LD 16:8 - 30摄氏度）和短光照周期-温暖温度（LD 8:16 - 30摄氏度）两种条件下饲养的鱼类中经常观察到睾丸退化。睾丸退化的特征是小叶细胞边界扭曲，以及在小叶内形成含有退化生殖细胞、血细胞和胶体物质的胶原胶囊。在静止期（R）和产卵期（SP），暴露于短光照周期条件下的鱼类（R - 73.33%，SP - 41.67%）的睾丸退化程度高于长光照周期条件下的鱼类（R - 50.83%，SP - 19.16%）和对照组（R - 20.83%，SP - 16.67%）。此外，静止期睾丸退化的频率分别为73.33%（短光照周期）、50.83%（长光照周期）和20.83%（对照组），而产卵期分别为41.67%（短光照周期）、19.16%（长光照周期）和16.67%（对照组）。在本研究中，静止期比产卵期出现更多睾丸退化的情况可能是由于鱼类内源条件的变化。
