碧流河水库马口鱼的食性及渔业对策

The food habit of Opariichthys bidens in Biliuhe reservoir and fishery countermea sure

马口鱼是碧流河水库主要的敌害鱼类，对各种经济鱼类有一定影响。４～１２月的摄食率平均达７３．３％，食物中鲢、鳙的出现率均在７％左右。每年应在马口鱼产卵集群时，于沿岸用刺网、小拉网集中捕杀，以控制其种群数量。为减小马口鱼对主要养殖鱼类的危害，每年投放的鲢、鳙鱼种规格应保证在１１．６ｃｍ以上。

Opsariichthys bidens is a chiefly harmful species for each economic fish in Biliuhe reservoir. Itsfeeding percentage is 73.3%and the vate of incidence for silver carp and bighead carp both areabout 7%,In order to contrl fhe population,it had better concentrate catching it in its spawn pe-riod.