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IJMS Vol.40(4) [August 2011] >


Title: Sex-ratio, maturation and spawning of the Indian ilisha, ilisha melastoma (clupeiformes: pristigasteridae) in coastal waters of Pakistan (northern Arabian Sea)
Authors: Mahmood, Khalid
Ayub, Zarrien
Siddiqui, Ghazala
Keywords: Maturation
Spawning
Indian ilisha
Pakistan
Issue Date: Aug-2011
Publisher: NISCAIR-CSIR, India
Abstract: Present study showed that the over-all sex-ratio deviated in favour of females in Ilisha melastoma. However, the sex-ratio was approximately 1:1 in certain months while in others it was in favor of females. Similarly the sex-ratio deviated from 1:1 ratio in different size-classes. Minimum size at which the specimens of I. melastoma get matured is 14.9 cm in total length (11.5 cm in SL). Four maturation stages of ovaries, namely, immature, ripening, ripe and spent/recovering were recognized in I. melastoma. Two peaks of spawning were observed in this species, the major peak was from February to May and the minor peak appeared in August to November.
Page(s): 516-521
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Source:IJMS Vol.40(4) [August 2011]

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