Reproductive biology of the Indian scad, Decapterus russelli (Ruppell, 1830) from Maharashtra waters, Northwest coast of India

Poojary, Nalini and Tiwari, L R and Sundaram, Sujit (2015) Reproductive biology of the Indian scad, Decapterus russelli (Ruppell, 1830) from Maharashtra waters, Northwest coast of India. Journal of the Marine Biological Association of India, 57 (1). pp. 71-77. ISSN 2321-7898

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    Abstract

    The length at which 50% of females of Decapterus russelli attain maturity was estimated at 153 mm. The presence of mature, ripe and spent gonads was observed from June to October and December to April indicating prolonged spawning season. The sex-ratio varied from 1:0.43 in 140-149 mm to 1:1 in 110-119 mm length groups. Month-wise distribution of sex-ratio indicated significant predominance of male at 5% in April, May and November. The absolute fecundity ranged from 29,986 to 1,52,123 eggs. Based on the GSI studies it is inferred that the species has a prolonged spawning season probably falling between December to March and June to October. The relative condition factor value was highest in January which indicates the peak spawning month. Length-wise condition factor of males and females were maximum in the length range of 100-229 mm. In the present study size of ova diameter ranged from 0.01 to 0.97 mm. The species seems to spawn twice in a season and the period between two spawning may not be a long one.

    Item Type: Article
    Uncontrolled Keywords: Decapterus russelli, Maharashtra, length at maturity, spawning season, fecundity, sex-ratio
    Subjects: Fishery biology
    Divisions: CMFRI-Mumbai
    Depositing User: Arun Surendran
    Date Deposited: 04 Dec 2015 10:08
    Last Modified: 04 Dec 2015 10:08
    URI: http://eprints.cmfri.org.in/id/eprint/10573

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