Dietary administration of an LHRH analogue induces spawning of spotted seatrout (Cynoscion nebulosus) |
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Authors: | Peter Thomas Norman W Boyd |
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Institution: | The University of Texas Marine Science Institute, Port Aransas, TX 78373, U.S.A. |
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Abstract: | The effects of a single oral administration of des-Gly10-D-Ala6]-luteinizing hormone-releasing hormone (1–9)-ethylamide (LHRHa) in the diet (0.2–2.5 mg/kg body weight) on ovulation and spawning of spotted seatrout (Cynoscion nebulosus) were examined. Oral administration of 1.0–2.5 mg LHRHa/kg to females in four separate experiments resulted in successful spawning 32–38 h later with mean fertilization and hatching success rates of 93.3% and 74.6%, respectively. A lower dose of LHRHa (0.2 mg/kg) was ineffective in two subsequent experiments. The data suggest that oral administration of 1 mg LHRHa/kg is a reliable method of inducing ovulation in spotted seatrout, resulting in predictable spawning within 38 h of feeding. This noninvasive treatment may be particularly useful for induced spawning of teleosts which are susceptible to handling stress. |
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