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Spinibarbus caldwellii can spawn several times a year with spawning peaks in May,August and October.The sex ratio of female to male was 1:0.58,peaked in May at 1:0.67.The fecundity of S.caldwelli was low,varying from 2200 to 14181 with an average of 6041 eggs.The egg size could be up to 2.4 mm,averaging 1.94 mm,in diameter.The relation between the absolute fecundity and body weight was R=1265.9e3.8805W(r=0.9337),and that between the absolute fecundity and body length was R=48.425L1.4493(r=0.9585).The body lengths of spawning stock were between 20.0 cm and 30.0 cm,and the body weight ranged from 0.35 kg to 0.75 kg.The spawning stock was mainly 3-year-olds.
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