Embryogenesis and Early Growth of Pure Strains and Hybrids of Sharptooth CatfishClarias gariepinusand SampaHeterobranchus longifilis
| Autor: | V. T. Okomoda, G. Shuibu, S. O. Olufeagba |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Clarias gariepinus Larva food.ingredient biology Hatching 010604 marine biology & hydrobiology Embryogenesis 04 agricultural and veterinary sciences Anatomy Aquatic Science biology.organism_classification 01 natural sciences food Human fertilization Animal science Yolk 040102 fisheries 0401 agriculture forestry and fisheries Heterobranchus Hybrid |
| Zdroj: | North American Journal of Aquaculture. 78:346-355 |
| ISSN: | 1548-8454 1522-2055 |
| Popis: | The embryonic development, early growth and survival of pure and reciprocal hybrid crosses of Sharptooth Catfish Clarias gariepinus and Sampa Heterobranchus longifilis were studied. The morula and blastula stages occurred 5 and 10 min earlier, respectively, in pure crosses (at 4 h, 10 min and 5 h after fertilization, respectively) than in hybrids. Timing of gastrulation in pure strain H. longifilis and the ♀ H. longifilis × ♂ C. gariepinus cross was earlier (9 h) than in pure strain C. gariepinus and ♀C. gariepinus × ♂ H. longifilis (9 h, 25 min), but similar timings were recorded during the somite stages (18 h). Hatching started at 23 h in H. longifilis, at 23 h, 10 min in C. gariepinus, and at 23 h, 15 min in the hybrids. Yolk absorption was complete in 4 d, but exogenous feeding began on the third day (72 h) when larvae weighed 0.7± 0.01 mg (mean ± SE). After 4 weeks of feeding ad libitum with shell-free Artemia, pure crosses of both species grew better than the hybrids, and C. gariepinus recor... |
| Databáze: | OpenAIRE |
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