COMPARATIVE ASSESSMENT OF EMBRYONIC DEVELOPMENT IN Clarias gariepinus FROM BROODERS OF DIFFERENT AGES
DOI:
https://doi.org/10.33003/jaat.2025.1102.019Abstract
The embryonic and early post-embryonic developmental study of African catfish produced from 6, 9, 12 and 15 months old experimental breeders were examined in an indoor incubation water temperature range within 28oC to 30oC. The various stages of the eggs development was viewed under a microscope, from unfertilised oocytes to the initial cleavage to hatching stages. Despite the age disparities between the different breeders (6, 9, 12, & 15 months old), there were no significant changes in the embryonic development of the eggs. The precise minute-by-minute timing and thorough activities of every step were examined, the unfertilised oocyte at 0 minutes, fertilised stripped eggs at 2 minutes, blastodisc/animal pole and vegetal pole stage at 30 minutes, and one-daughter cell stage at 34 minutes after fertilisation. The stages of two daughter cells were observed at 38 minutes, four daughter cells at 52 minutes, eight daughter cells at 63 minutes and sixteen daughter cells at 77 minutes. Up to 24 hours after fertilisation, the following stages were observed: thirty-two-daughter cell stage at 80 minutes, morula stage at 100 minutes, blastula stage at 125 minutes, gastrula stage at 320 minutes, somite stage at 583 minutes and hatching commencing stage at 1099 minutes (18 hours: 32 minutes). The study helped to understand the embryonic and early post-embryonic development of African catfish. Fish hatchery operators will benefit from this result, as it provides information on egg and larvae status at different ages of the brooders.
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