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KMID : 0894520170210020223
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Development & Reproduction
2017 Volume.21 No. 2 p.223 ~ p.228
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Effects of Photoperiod Manipulation on Gonadal Activity of the Damselfish, Chromis notata
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Lee Chi-Hoon
Park Young-Ju
Lee Young-Don
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Abstract
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This study investigated the effect of different photoperiods (14L: 10D, 12L:12D and 10L:14D) on the gonadal development and GtH mRNA expression in the pituitary of damselfish. The results showed that gonadosomatic index (GSI) was significantly lower in shot photoperiod (10L:14D), in comparison with other photoperiodic group during the spawning season. After 60 days treatment, histological analysis of gonad tissue showed that the gonad of 10L:14D and 12L: 12D treat-ment groups were resting phase with spermatogonia and perinucleolus stage oocytes but the gonad of 14L:10D treatment group was still ripe phase with spermatozoa and mature stage oocyte. The FSHβ and LHβ mRNA expression in pituitary dras-tically decreased shot photoperiod treatment from July (spawning period). These results suggest that photoperiod is consid-ered to be the most effective environmental factor in controlling the reproductive cycle of damselfish.
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KEYWORD
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Photoperiod, Gonadal development, FSHβ, LHβ, Damselfish, Chromis notata
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