Effects of temperature on the growth,feeding,and digestive enzyme activity of the juvenile red swamp crayfish （Procambarus clarkii）

doi:10.14088/j.cnki.issn0439-8114.2021.20.025

Abstract

Abstract: In order to study the effects of temperature on the growth, feeding, and digestive enzyme activity of the juvenile red swamp crayfish Procambarus clarkii. The juvenile crayfish（3.11±0.04 g） were selected. The object was randomly divided into 4 temperature treatment groups（23, 26, 29, 31 ℃）, and the temperature of the culture water was adjusted by a heating rod and the experiment period was 8 weeks. The results showed that the growth of body length and body weight of juvenile crayfish was the fastest at 26 ℃, which was significantly higher than the other three temperature conditions（P<0.05）. The body length and weight of juvenile crayfish increased rapidly at 29 ℃ and 31 ℃, both significantly higher than 23 ℃（P<0.05）. The temperature difference did not significantly change the condition factor of crayfish（P>0.05）. At 23 ℃, the survival rate of juvenile shrimp was the highest, up to 100%, which was significantly higher than the other three temperature conditions（P<0.05）. Among them, the survival rate was the lowest at 31 ℃, only 89%. At four temperatures, the feed coefficient was highest at 23 ℃ significantly higher than the other three temperature conditions（P<0.05）, and the feed coefficient was lowest at 26 ℃, significantly lower than 23 ℃（P<0.05）. There was no significant difference in the feed rate of Procambarus clarkii under four temperature conditions（P>0.05）. The activities of digestive enzymes （protease, lipase, amylase） gradually increased with increasing temperature, but decreased with increasing temperature.

Key words: Procambarus clarkii, temperature, growth, feeding, digestive enzyme

CLC Number:

S966.12

ZHOU Ze-xiang, FAN Wen-hao, FANG Liu, RUAN Guo-liang, GUO Xiao-ze, LIU Xin, ZHENG Wei-you. Effects of temperature on the growth,feeding,and digestive enzyme activity of the juvenile red swamp crayfish （Procambarus clarkii）[J]. HUBEI AGRICULTURAL SCIENCES, 2021, 60(20): 127-130.

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