Effects of different temperature on the growth, enzyme activity and hydrochemical state of pseudosciaena croceaAuthor(s): Ruan Chengxu, Yuan Chonggui
This experiment researched effects of different temperature on the growth, enzyme activity and hydrochemical state of pseudosciaena crocea through seven temperature groups 20ôÂÂ¨, 22ôÂÂ¨, 24ôÂÂ¨, 26ôÂÂ¨, 28ôÂÂ¨, 30ôÂÂ¨ and 32ôÂÂ¨. 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 28ôÂÂ¨, 30ôÂÂ¨ and 32ôÂÂ¨(P>0.05). When temperature was above 26ôÂÂ¨, 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.