Distribution and Early-life Development of Thai River Sprat Clupeichthys aesarnensisWongratana, Larvae, in Pasak Jolasid Reservoir, Lop Buri Province, Thailand
Keywords:
Thai river sprat, fish larvae, Pasak Jolasid reservoirAbstract
The 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<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% of larval number) and low in dry season (December 2003 to February 2004: 1.46% 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%NL in yolk-sac larvae and moved to the mid-portion or 59%TL in juvenile.
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