The effects of different Ca2+ concentration fluctuation on the moulting,growth and energy budget of juvenile Litopenaeus vannamei (Boone) |
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| Authors: | Chunqiang Hou Fang Wang Shuanglin Dong Yujie Zhu |
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| Institution: | The key laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, China |
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| Abstract: | A 40‐day experiment was conducted to investigate the effects of different Ca2+ concentration fluctuation on the moulting, growth and energy budget of juvenile Litopenaeus vannamei with an initial wet body weight of (1.20±0.01) g. The Ca2+ concentration of the control group C385 was 385 mg L?1 throughout the experiment, while the Ca2+ concentration of the C591, C803, C1155 and C2380 groups periodically fluctuated from 385 to 591, 803, 1155 and 2380 mg L?1 respectively. The moulting frequency (MF) of the shrimp in the Ca2+ concentration fluctuating groups was significantly higher than those in the control group (P<0.05). The specific growth rates (SGRd) and feed intake of the shrimp in the C591 and C803 groups were significantly higher than those in other groups (P<0.05), but no significant differences in feed efficiency were found among all groups (P>0.05). The shrimp in C591 and C803 groups spent significantly less energy in respiration, while depositing significantly more energy for growth than those in other three groups (P<0.05). These results showed that proper Ca2+ concentration fluctuation could increase the MF and growth rate of the juvenile L. vannamei, and according to the regression formula made using SGRd and range of Ca2+ concentration fluctuation, periodically enhanced Ca2+ concentration of 295 mg L?1 in the seawater was suggested to be used in shrimp culture. |
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| Keywords: | Litopenaeus vannamei Ca2+ concentration fluctuation moulting growth energy budget |
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