Effects of different temperature on the growth, enzyme activity and hydrochemical state of pseudosciaena crocea

Ruan Chengxu, Yuan Chonggui

Abstract

This experiment researched effects of different temperature on the growth, enzyme activity and hydrochemical state of pseudosciaena crocea through seven temperature groups 20􀔨, 22􀔨, 24􀔨, 26􀔨, 28􀔨, 30􀔨 and 32􀔨. Water was not changed in the experiment. Research result shows that different temperature obviously (P<0.05) affects feeding amount, specific growing rate, feed efficiency and condition factor of pseudosciaena crocea. There was not much difference on growing rate and feeding efficiency at 28􀔨, 30􀔨 and 32􀔨(P>0.05). When temperature was above 26􀔨, pepsin and hind intestine protease activities of pseudosciaena crocea increased obviously (P>0.05). Amylase and lipase activities increased as temperature rose; but there was no big difference among groups (P>0.05). Content of NH4 +-N and NO2 --N of farming water increased as a whole while PH value of water decreased.