Spawning period and fecundity of Neolissochilus soroides (Duncker, 1904)(Pisces, Teleostei, Cyprinidae) from a small Malaysian stream

Authors: MD ZAIN KHAIRONIZAM, MOHD ZAKARIA ISMAIL

Abstract: Spawning and fecundity aspects of a cyprinid fish, Neolissochilus soroides (Duncker, 1904), from the Gombak River of Peninsular Malaysia were studied from November 2009 to October 2010. Results show that the fish reproduced year-round, but 2 peaks of fecundity were observed, coinciding with high rainfall distribution during November and April. The gonadosomatic index for both sexes was comparatively higher in the wet seasons. The high numbers of ripening and ripe oocytes observed during the wet seasons and the oocyte diameter distribution indicate that the species is a total spawner, with batches of ripe oocytes that are released over an extended time period. Absolute fecundity is highly related to ovary weight rather than body weight and total length.

Keywords: Gonadosomatic index, oocyte development, Gombak River

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