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- W2022984443 abstract "Abstract A major problem in tilapia aquaculture is the frequent reproduction of female fish, leading to increased competition for supplemented food and stunted somatic growth. The feasibility of using photoperiod manipulation to arrest the reproductive performance of tilapia Oreochromis niloticus was therefore examined. Newly hatched O. niloticus were reared in the laboratory under 12L:12D photoperiod at 28 °C. Fish (230–340 g) were maintained under 6L:6D, 12L:12D and 14L:10D photoperiod at 28 °C during the course of this study. Effect of photoperiod manipulation on reproductive parameters of fecundity, gamete quality, offspring viability and overall reproductive success were evaluated. Steroid levels (estradiol-17β, E2; testosterone, T) during the spawning cycles of fish were analyzed on days 1 and 3 postspawning and at 3-day intervals thereafter. A total of 72 female fish from each photoperiod treatment were investigated the changing pattern of E2, T and GSI with fish that have spawned once, twice and three times. Fish exposed to 12L:12D and 14L:10D photoperiod spawned successfully throughout the study. Whereas the spawning of fish exposed to 6L:6D photoperiod was arrested after three to four spawning cycles. The arrestment of spawning in fish exposed to 6L:6D photoperiod was paralleled by a significant decrease in plasma levels of E2 (P" @default.
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- W2022984443 date "2005-01-01" @default.
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- W2022984443 title "Control of reproduction in Nile tilapia Oreochromis niloticus (L.) by photoperiod manipulation" @default.
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- W2022984443 doi "https://doi.org/10.1016/j.aquaculture.2004.10.008" @default.
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