Extraretinal photoreception involved In photoperiodic effects on gonadal activity in the Indian murrel,Channa (Ophiocephalus) punctatus (Bloch)
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The effects of blinding onChanna punctatus exposed to LD 14:10, 12:12, 9:15, continuous dark (DD) and continuous light (LL) was studied during the winter quiescent phase of the annual reproductive cycle. Ovarian weights of blinded fish exposed to LD 14:10, 12:12 or LL were higher than those exposed to LD 9:15 or DD. However, no effects of blinding on testicular recrudescence under any photoperiodic regime were observed. Studies suggest that in addition to the eyes, other extraocular photoreceptors are also involved for gathering information on day length.
KeywordsChanna punctatus photoreception extraretinal extrapineal blinding gonadal response photoperiod
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