Advancement and synchronisation of spawning in Salmo gairdneri and S. trutta following administration of LRH-A combined or not with pimozide
Identifieur interne : 002003 ( Main/Exploration ); précédent : 002002; suivant : 002004Advancement and synchronisation of spawning in Salmo gairdneri and S. trutta following administration of LRH-A combined or not with pimozide
Auteurs : R. Billard [France] ; P. Reinaud [France] ; M. G. Hollebecq [France] ; B. Breton [France]Source :
- Aquaculture [ 0044-8486 ] ; 1984.
Abstract
Prior to the onset of the spawning season female rainbow trout were injected intraperitoneally (IP) with LRH-A ([des Gly10 D-Ala6] LHRH ethylamide) alone at a dose of 1 μg/kg body weight or in combination with pimozide (PIM, 10 mg/kg body weight), a dopamine antagonist, given 6 h before the LRH-A. Pimozide + LRH-A and pimozide alone induced a significant elevation in plasma GTH but only PIM + LRH-A consistently advanded ovulation. Egg quality was altered with PIM + LRH-A and PIM + saline, resulting in lower survival at the eyed stage.Prior to the onset of the spawning period, brown trout were injected IP with LRH-A alone at doses of 1, 10 and 20 μg/kg body weight. A single injection slightly initiated and synchronized ovulation at doses of 10 and 20 μg; a second injection given 6 days later did not modify the ovulation profile. There was no effect when the same doses were given in pelleted form in silicone rubber implants. When LRH-A and PIM were injected IP 6 h apart at doses of 10 and 1 mg/kg body weight PIM and 10 μg/kg body weight LRH-A, ovulation was slightly stimulated. The effects of LRH-A given in silicone rubber implants were potentiated by simultaneous injection of PIM (10 mg/kg body weight). No alteration of egg quality was observed after these various treatments on brown trout.
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DOI: 10.1016/0044-8486(84)90009-7
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Billard</name><affiliation wicri:level="0"><country wicri:rule="zip">France</country></affiliation></author><author><name sortKey="Reinaud, P" sort="Reinaud, P" uniqKey="Reinaud P" first="P." last="Reinaud">P. Reinaud</name><affiliation wicri:level="0"><country wicri:rule="zip">France</country></affiliation></author><author><name sortKey="Hollebecq, M G" sort="Hollebecq, M G" uniqKey="Hollebecq M" first="M. G." last="Hollebecq">M. G. Hollebecq</name><affiliation wicri:level="0"><country wicri:rule="zip">France</country></affiliation></author><author><name sortKey="Breton, B" sort="Breton, B" uniqKey="Breton B" first="B." last="Breton">B. 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Pimozide + LRH-A and pimozide alone induced a significant elevation in plasma GTH but only PIM + LRH-A consistently advanded ovulation. Egg quality was altered with PIM + LRH-A and PIM + saline, resulting in lower survival at the eyed stage.Prior to the onset of the spawning period, brown trout were injected IP with LRH-A alone at doses of 1, 10 and 20 μg/kg body weight. A single injection slightly initiated and synchronized ovulation at doses of 10 and 20 μg; a second injection given 6 days later did not modify the ovulation profile. There was no effect when the same doses were given in pelleted form in silicone rubber implants. When LRH-A and PIM were injected IP 6 h apart at doses of 10 and 1 mg/kg body weight PIM and 10 μg/kg body weight LRH-A, ovulation was slightly stimulated. The effects of LRH-A given in silicone rubber implants were potentiated by simultaneous injection of PIM (10 mg/kg body weight). 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