Compensatory Growth of Juvenile Brown Flounder Paralichthys olivaceus Following Low Temperature Treatment for Different Periods  

作　　者：PENG Yinhui LIU Xiujia HUANG Guoqiang WEI Liuzhi ZHANG Xiumei 

机构地区：[1]Guangxi Key Laboratory of Marine Biotechnology,Guangxi Institute of Oceanology [2]Key Laboratory of Mariculture of Ministry of Education,Ocean University of China

出　　处：《Journal of Ocean University of China》2017年第2期326-332,共7页中国海洋大学学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.30600462)

摘　　要：We investigated the effects of low temperature(8.5℃) on the growth and feeding rates and feed conversion efficiency of juvenile P.olivaceus with an average initial weight of 3.87 ± 0.06 g(mean ± SE).Fish were exposed to 8.5℃ for 0(control),1,2,3 and 4 weeks,and then to 20℃ for 10,9,8,7 and 6 weeks,respectively.Low temperature clearly led to growth depression.The weight of fish exposed to low temperature for 1 week was restored to that of control,while that of fish exposed to low temperature longer was significantly decreased(P < 0.05).During the entire low-temperature period,specific growth rate,feeding rate and feed conversion efficiency of the fish were significantly lower(P < 0.05) than those of control,while in the whole recovery period,specific growth and average feeding rate were markedly higher(P < 0.05) than those of control.At the end of experiment,only the feeding rate of the fish exposed to low temperature for 1 week was not significantly different from that of control(P > 0.05).Feeding rate and feed conversion efficiency were reduced at low temperature in juvenile P.olivaceus.The compensatory growth of juvenile P.olivaceus may therefore be attributed to the improvement of feeding rate.Our results suggested that growth depression occurs when juvenile P.olivaceus are exposed to low temperature for more than one week.We investigated the effects of low temperature (8.5°C) on the growth and feeding rates and feed conversion efficiency of juvenile P. olivaceus with an average initial weight of 3.87 ± 0.06 g (mean ± SE). Fish were exposed to 8.5°C for 0 (control), 1, 2, 3 and 4 weeks, and then to 20°C for 10, 9, 8, 7 and 6 weeks, respectively. Low temperature clearly led to growth depression. The weight of fish exposed to low temperature for 1 week was restored to that of control, while that of fish exposed to low temperature longer was significantly decreased (P < 0.05). During the entire low-temperature period, specific growth rate, feeding rate and feed conversion efficiency of the fish were significantly lower (P < 0.05) than those of control, while in the whole recovery period, specific growth and average feeding rate were markedly higher (P < 0.05) than those of control. At the end of experiment, only the feeding rate of the fish exposed to low temperature for 1 week was not significantly different from that of control (P > 0.05). Feeding rate and feed conversion efficiency were reduced at low temperature in juvenile P. olivaceus. The compensatory growth of juvenile P. olivaceus may therefore be attributed to the improvement of feeding rate. Our results suggested that growth depression occurs when juvenile P. olivaceus are exposed to low temperature for more than one week.

关 键 词：PARALICHTHYS OLIVACEUS COMPENSATORY growth low temperature exposure feeding rate 

分 类 号：S917.4[农业科学—水产科学]