池养白鲫的食性和生长及其养殖的研究

本文对池养条件下白鲫Carassiusc cassius cuvieri(Temminok et Sohlegel)食性相生长及其饲养进行了研究。体长与年龄呈直线关系，体重与年龄呈指数关系。白鲫食性随着生长发育进程而有一定的阶段性，摄食强度呈现出随体长和体重的增长而变弱的趋势．生长亦有差异，幼鱼生长过程因发育阶段而异，前期较后期快；性成熟后生长缓慢，雄鱼更甚．其体长与体重关系为：幼鱼W=0．00001314L3.2428；成鱼W=0．00002232L^2.9397。在渔业生产上对鱼苗和鱼种的饲养过程分为三个阶段似较合理．成鱼饲养中作为搭养鱼类，投放春片鱼种具有显著的增产效果和较高的经济价值．

GROWTH AND FEEDING HABITS OF WHITE CRUCIAN CARP( CARASSIUS CARASSIUS CUVIERI TEM. & SCHL.)IN POND REARING

The present paper deals with the growth and feeding habits of thewhitecrucian carp at different development stages under pond-rearing conditions inSichuan. The relationship of body length (L)/age (t) falls on a striaght line, whilethat of weight (W)/age (t) is exponential. The regression equation of length orweight and age are determined through calculation. The growth of the fingerling is very fast in the first 20 days, and graduallyslower afterwards. The demarcation is at the body length reached to 20mm. The general length-weight equation of the crucian carp, based on the measur-ement of 3697 individuals, can be expressed as follows: 1-year W=0.00001314 L~(8.242?) 2-year W=0.00002232 L~(2.9897) 3-year W=0.00002855 L~(8.8797) Breeding season W=0.000005350 L~(?.3797) The feeding habits of the fingerling indicates that the fry feeds on zooplanktonmainly, it becomes to be omnivorous while the body length exceeds 23 mm. Intesti-nal contents show that at fry stage, the fish takes solely on zooplankton as soon asit begins feed The adult takes more plants and debris than animals foods.