Effects of various latency periods on fertilization, hatchability and survival of Clarias gariepinus
The latency period of post-ovulation of Clarias gariepinus has been demonstrated to affect the viability of its eggs and embryos. This study has examined the effects of various latency periods on the viability of eggs, fertilization, hatchability and survival of the African catfish Clarias gariepinus. Progenies were produced using eggs successively stripped from the African catfish at 10, 12, 14, 16, 18, 20, 17, 14, 21 and 22 hours of post-ovulation. Some eggs and sperm were delayed while others were used fresh. Low survival, hatchability and fertilization rates were observed in treatments 1 and 3, while an average percentage of fertilization, hatchability and survival rates were obtained in treatments 2 and 4. High rates of fertilization and hatchability as well as a considerable rate of survival of progeny after 21days of indoor rearing was obtained in 14-hour latency period at a temperature of 24.8oC and was significantly different (P<0.05). Therefore, any attempt to improve fingerlings production in Clarias gariepinus must consider the effects of latency period in relation to water temperature, and the best latency period achieved in this study was 14 hours.
| Main Authors: | , , |
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| Format: | conference_item biblioteca |
| Language: | English |
| Published: |
Fisheries Society of Nigeria
2010
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| Subjects: | Aquaculture, Nigeria, Abeokuta, Hatchability, Latency period, freshwater environment, Biological fertilization, Hatching, Ovulation, Survival, Breeding success, Induced breeding, Aquaculture techniques, |
| Online Access: | http://hdl.handle.net/1834/38193 |
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