Ecology, Environment and Conservation Paper

Vol 20, Issue 3, 2014; Page No.(929-941)

STUDIES ON EMBRYONIC AND LARVAL DEVELOPMENT OF INDUCED BRED CHANNA STRIATUS

Bilal Ahmad Paray, M.A. Haniffa and Y. Ananth Kumar

Abstract

Synthetic hormone Luteinizing Hormone Releasing Hormone analogue (LHRHa) with different doses (Low - 50 μg/kg BW, Medium – 60- μg/kg BW and High —-- 70 μg/kg BW) was used for induced spawning. Latency period, incubation period, fertilization rate and hatching rate were studied as a function of different dosages of hormone. By overall performance with regard to number of eggs spawned, latency period, fertilization rate and hatching rate, the present investigation confirms that High dose of LHRHa (70μg) was found to be the most potent ovulating agent in Channa striatus. The embryonic stages occurred inside the chorion was completed before hatching. The diameter of fully swollen fertilized eggs varied from 1.22-1.45 mm. The first cleavage commenced 20 min after fertilization and after 5 - 6 hr embryo attained blastula stage. The embryonic development of Channa striatus was completed within 22- 26 hr. Hatchlings of Channa striatus ranged from 2.8 - 3.6mm (mean ± SD: 3.2 ± 0.2) mm in total length characterised by presence of an almost round yolk sac, occupying about 45% of total length. Mouth was formed as a terminal opening when the larve was 36h old(5.1±0.2 mm) and the reserved yolk material was completely absorbed in 3 days old larva (5.8 ±0.5 mm) and ontogeny was completed inn 20 days old larva (22.9±0.5 mm) and the fry resembled the adults in all characteristics except maturity.

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