Effects of human chorionic gonadotropin (HCG), toad and Clarias pituitary hormogenates on spawning in the catfish: Clarias Lazera (C. and V.) and Clarias anguillaris (Linne)

Nwoko, C.U. (1985) Effects of human chorionic gonadotropin (HCG), toad and Clarias pituitary hormogenates on spawning in the catfish: Clarias Lazera (C. and V.) and Clarias anguillaris (Linne). In: 4th Annual Conference of the Fisheries Society of Nigeria (FISON) , 26-29 November, 1985 ,Port-Harcourt, Nigeria, pp. 129-135.

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Abstract

Experiment on induced spawning of Clarias lazera and C. anguillaris using human chorionic gonadotropin (HCG) freshly prepared toad and Clarias pituitary hormogenates were carried out. Clarias pituitary hormogenates induced spawning in C. lazera and C. anguillaris at dosage levels of 0.27-0.46 mg/150 g body weight or 2 glands/fish of equivalent weights. HCG induced spawning in C. anguillaris at 500 i.u/500 g body weight but failed in C. lazera. Toad pituitary was not successful at even a higher dosage level of 0.60 mg/150 g body weight. The implications of these results are discussed. Spawning occurred in the HCG (and Clarias pituitary treated females in less than 12 hours after injection and subsequent examination of ovaries of the spawned fish showed incomplete spawning. Furthermore, fertilization occurred, following spawning in the piscine pituitary hormone treated male and female fish but failed in the HCG (treated pair. A mean fertilization rate of 50-90% was recorded. Possible explanations of these observations are advanced. The hatching time of 24-48 hours and a mean hatching rate of 75-90% were recorded. A high larval mortality of up to 95% was observed in the post yolk-sac stag after 8 days. The need for the development of appropriate larval food for Clarias species in culture practice is stressed

Item Type: Conference or Workshop Item
Title: Effects of human chorionic gonadotropin (HCG), toad and Clarias pituitary hormogenates on spawning in the catfish: Clarias Lazera (C. and V.) and Clarias anguillaris (Linne)
Personal Creator/Author:
CreatorsEmail
Nwoko, C.U.
Page Range: pp. 129-135
Date: 1985
Event Title: 4th Annual Conference of the Fisheries Society of Nigeria (FISON)
Event Type: Conference
Event Location: Port-Harcourt, Nigeria
Event Dates: 26-29 November, 1985
Issuing Agency: Fisheries Society of Nigeria
Uncontrolled Keywords: Nigeria; aquaculture techniques; fish culture; induced breeding; pituitary gland; sex hormones; Clarias anguillaris; Clarias lazera
Subjects: Aquaculture
Item ID: 3402
Depositing User: Ms Maria Kalentsits
Date Deposited: 19 May 2010 15:14
Last Modified: 29 Sep 2011 17:29
URI: http://aquaticcommons.org/id/eprint/3402

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