Broodstock development and induced spawning of the John’s snapper Lutjanus johnii (Bloch, 1792) under controlled conditions

Senthil Murugan, T and Divu, D and Rao, K Srinivasa and Philipose, K K (2016) Broodstock development and induced spawning of the John’s snapper Lutjanus johnii (Bloch, 1792) under controlled conditions. Indian Journal of Fisheries, 63 (1). pp. 117-119.

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    Abstract

    Broodstock of the John’s snapper Lutjanus johnii were raised in sea cages from wild collected juveniles of the species. Individual fishes were tagged using passive integrated transponders (PIT), cannulated and gonadal biopsies were examined periodically for assessing the maturity status. The matured fishes were shifted from cages and maintained in indoor FRP tanks. Females were given two doses of human chorionic gonadotropin (hCG) and ovaprim @ 800 - 900 IU kg-1 and 1.25ml kg-1 respectively. Males were given only hCG in a range between 400 and 600 IU kg-1. Two successful spawning were obtained with 80-85% fertilisation rate. In both the trials, embryonic development was observed to be arrested before hatching which could be attributed to nutritional deficiency of the broodfishes and high water temperature in the spawning tank.

    Item Type: Article
    Uncontrolled Keywords: Broodstock development, Hormonal induction, John’s snapper, Lutjanus johnii, Spawning
    Subjects: Aquaculture
    Demersal Fishes > Snappers
    Divisions: CMFRI-Karwar
    Depositing User: Arun Surendran
    Date Deposited: 18 Sep 2019 10:10
    Last Modified: 18 Sep 2019 10:10
    URI: http://eprints.cmfri.org.in/id/eprint/13842

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