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Spawning performance of Clarias gariepinus (Burchell, 1822) induced with ethanol preserved and fresh catfish pituitary extract

Published online by Cambridge University Press:  20 June 2017

V.T. Okomoda*
Affiliation:
Department of Fisheries and Aquaculture, University of Agriculture Makurdi, Nigeria.
L.O. Tiamiyu
Affiliation:
Department of Fisheries and Aquaculture, University of Agriculture Makurdi, Nigeria.
D. Kwaghger
Affiliation:
Department of Fisheries and Aquaculture, University of Agriculture Makurdi, Nigeria.
*
All correspondence to: V.T. Okomoda. Department of Fisheries and Aquaculture, University of Agriculture Makurdi, Nigeria. Tel: ±234 8033319959 E-mail: [email protected]

Summary

This study was conducted to determine the efficacy of preserved and fresh pituitary extract of Clarias gariepinus (Burchell, 1822) to induced spawning in the same species. Growth performance of fry was also monitored for 15 days to determine the possible effect of natural hormone treatment on the fry. Pituitary glands (PG) were obtained from 12 male broodstocks, six extracted PG were preserved in 96% ethanol 24 h before injection, while the other were extracted and used in their fresh state. The PG solutions (1 g ml−1 of saline water) were injected at 1 ml kg−1 of the female broodstock. Ovaprim® (a synthetic hormone) was used as the control and administered at a rate of 0.5 ml kg −1 of fish. After a uniform latency period of 9 h 30 min, fish were striped, fertilized, incubated and the performance evaluated. Results obtained revealed better hatching performance using Ovaprim® synthetic hormone (64.52%), however, preserved PG gave better hatchability (59.74%) than fresh PG extract (51.39%). After 15 days of feeding ad libitum with shell-free Artemia cysts, the growth of fry spawn with preserved PG was comparable with that of the control, while least performance was observed using the fresh PG. It was concluded that preservation of PG in ethanol 24 h before injection had a positive effect on breeding performance and could be exploited in the commercial production of C. gariepinus fingerlings.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2017 

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