Experiments were conducted to examine the effects of salinity fluctuation on the intermolt period and growth of Fenneropenaeus chi- nensis with an initial body weight of (0.553 2±0.000 1)g (mean plus or minus SE)...Experiments were conducted to examine the effects of salinity fluctuation on the intermolt period and growth of Fenneropenaeus chi- nensis with an initial body weight of (0.553 2±0.000 1)g (mean plus or minus SE). The salinity (S0) of the control treatment is 30 throughout the experiment, while the treatments S2, S4, S7 and S10 are subjected to different salinity fluctuations, and the ranges are 2, 4, 7 and 10, respectively. After a 30-day feeding trial, the longest and the shortest intermolt periods of the shrimp occur under Treatments S10 and S2, respectively (difference 37.14%). The special growth rates (SGR) of the shrimp under the five treatments are ranked as S7> S4> S2> S10> S0, and the SGR of the shrimp under Treatment S0 is lower than that under Treatments S4 and S7 by 22.36% and 28.11%, respectively (P< 0.05). The minimal feed intake (FI) of the experimental animals occurs in Treatment S0 (84.04% and 88.54% of that under Treatments S4 and S7, respectively) (P< 0.05). There are no significant differences in the food conversion efficiency (FCE) of the shrimp under the five treatments (P> 0.05).展开更多
The effects of various salinity fluctuation amplitudes （2, 4, 6 and 8） on the growth, osmolarity, Na＋-K＋-ATPase activity and Hsp70 of juvenile Fenneropenaeus chinensis cultured in seawater with a salinity of 20 we...The effects of various salinity fluctuation amplitudes （2, 4, 6 and 8） on the growth, osmolarity, Na＋-K＋-ATPase activity and Hsp70 of juvenile Fenneropenaeus chinensis cultured in seawater with a salinity of 20 were studied. The results show that weight gain in the salinity fluctuation treatments was better than that in control; in particular, the weight gain of treatments S4 and SO, at 231.8% and 196.3%, respectively, was significantly different （P〈0.05）. The hemolymph osmolarity of treatments SO, S2, S4, S6 and S8 was 635.4, 630.8, 623.6, 614.4 and 600.3 mOsm/kg, respectively, and decreased with increasing salinity fluctuation amplitude. The level of Na＋-K＋-ATPase activity in gills ofE chinensis was higher than that in hepatopancreas, but there were no significant differences among all treatments, either in gills or hepatopancreas （P〉0.05）. The relative level of Hsp70 in treatment $4 was 48.4% and 40.4% higher than control in muscle and eyestalks, respectively, with the highest values being recorded under a salinity fluctuation amplitude of 4.展开更多
文摘Experiments were conducted to examine the effects of salinity fluctuation on the intermolt period and growth of Fenneropenaeus chi- nensis with an initial body weight of (0.553 2±0.000 1)g (mean plus or minus SE). The salinity (S0) of the control treatment is 30 throughout the experiment, while the treatments S2, S4, S7 and S10 are subjected to different salinity fluctuations, and the ranges are 2, 4, 7 and 10, respectively. After a 30-day feeding trial, the longest and the shortest intermolt periods of the shrimp occur under Treatments S10 and S2, respectively (difference 37.14%). The special growth rates (SGR) of the shrimp under the five treatments are ranked as S7> S4> S2> S10> S0, and the SGR of the shrimp under Treatment S0 is lower than that under Treatments S4 and S7 by 22.36% and 28.11%, respectively (P< 0.05). The minimal feed intake (FI) of the experimental animals occurs in Treatment S0 (84.04% and 88.54% of that under Treatments S4 and S7, respectively) (P< 0.05). There are no significant differences in the food conversion efficiency (FCE) of the shrimp under the five treatments (P> 0.05).
基金Supported by the National Natural Science Foundation of China (No. 30571441)Reward Research Foundation for Talented Young and Middle Aged Scientists of Shandong,China (No. 2006BS07002)National Key Technology Research and Development Program of China (No. 2006BAD09A07)
文摘The effects of various salinity fluctuation amplitudes （2, 4, 6 and 8） on the growth, osmolarity, Na＋-K＋-ATPase activity and Hsp70 of juvenile Fenneropenaeus chinensis cultured in seawater with a salinity of 20 were studied. The results show that weight gain in the salinity fluctuation treatments was better than that in control; in particular, the weight gain of treatments S4 and SO, at 231.8% and 196.3%, respectively, was significantly different （P〈0.05）. The hemolymph osmolarity of treatments SO, S2, S4, S6 and S8 was 635.4, 630.8, 623.6, 614.4 and 600.3 mOsm/kg, respectively, and decreased with increasing salinity fluctuation amplitude. The level of Na＋-K＋-ATPase activity in gills ofE chinensis was higher than that in hepatopancreas, but there were no significant differences among all treatments, either in gills or hepatopancreas （P〉0.05）. The relative level of Hsp70 in treatment $4 was 48.4% and 40.4% higher than control in muscle and eyestalks, respectively, with the highest values being recorded under a salinity fluctuation amplitude of 4.
