Distribution and early-life development of Thai river sprat Clupeichthys aesarnensis Wongratana, larvae, in Pasak Jolasid Reservoir, Lop Buri province, Thailand
2006
Santi Poungcharean(Kasetsart University. Bangkhen Campus, Bangkok (Thailand). Faculty of Fisheries. Dept. of Fishery Biology) E-mail:[email protected]
Distribution of Thai river sprat Clupeichthys aesarnensis Wongratana, larvae, in Pasak Jolasid Reservoir, Lop Buri Province during April 2003 to February 2004 was studied bi-monthly by plankton net towing in 24 sampling stations. The environmental conditions and water qualities were recorded and measured in situ. The abundance of larvae showed differential significance in months (P LT 0.0001). The spawning of the Thai river sprat in Pasak Jolasid Reservoir occurred throughout the year but was high in early rainy season (June 2003: 46.87 percent of larval number) and low in dry season (December 2003 to February 2004: 1.46 percent of larval number) and irregularly in the reservoir. Development of myomere in yolk-sac larvae were not complete while the digestive gut opened at 82 percent NL in yolk-sac larvae and moved to the mid-portion or 59 percent TL in juvenile.
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