Indian Journal of Animal Research
Chief EditorK.M.L. Pathak
Print ISSN 0367-6722
Online ISSN 0976-0555
NAAS Rating 6.50
SJR 0.263
Impact Factor 0.4 (2024)
Chief EditorK.M.L. Pathak
Print ISSN 0367-6722
Online ISSN 0976-0555
NAAS Rating 6.50
SJR 0.263
Impact Factor 0.4 (2024)
Embryonic and larval development of an endangered catfish, Horabagrus brachysoma
Submitted05-05-2015|
Accepted08-10-2015|
First Online 02-04-2016|
The fertilised eggs of Asian sun catfish, Horabagrus brachysoma (Günther 1864) were demersal and pale yellow in colour with equal perivitelline space. First cleavage appeared at 49 min (± 3 min) and the size of the blastomeres reduced as the development stage proceeded. Morula stage was reached 3 h 37 min (± 15 min) post-fertilization. The embryonic development from morula to hatching took about 16-17 h. The hatching of eggs started at 20 h 46 min (± 28 min) post-fertilization. The newly hatched yolk-sac larvae were 3-4 mm in length. A membranous layer was found covering from behind the head to posterior part of yolk-sac. Eye, mouth, alimentary canal, barbells and pectoral fins were appeared in the 3 days after hatch (dah). The membranous layer started rupturing at fifth day of post-hatch and disappeared during 9-12 dah with the appearance of fins in different parts of body. Pigments on dorsal side of body appeared in 2 dah larvae and the 10-12 dah larva looked pale brown in colour. After 12 dah, the larva morphologically resembled like an adult fish.
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