Fu Lv^*, Qing Nie, Yebing Yu, Fei Liu, Linlan Lv, Weihong Zhao

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College of Marine and Bioengineering, Jiangsu Key Laboratory of Biochemistry and Biotechnology of Marine Wetland and Key Laboratory for Aquaculture and Ecology of Coastal Pool of Jiangsu Province, Yancheng Institute of Technology, Yancheng, China.
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Abstract: In this study, the effects of different salinity levels (9, 12, 15, 18, 21, 24, 27, 30, and 33) on the growth performance, body composition, antioxidant indexes of Perinereis aibuhitensis (initial average mass, 20.4 ± 0.3 mg) and total nitrogen in the substrate were investigated. The survival rate, specific growth rate, feed coefficient, and protein efficiency ratio under different salinity levels were measured. The results showed that the survival rate of P. aibuhitensis at the salinity level of 9 was significantly lower than that of P. aibuhitensis at other salinity levels (P < 0.05). However, the survival rate of P. aibuhitensis at other salinity levels was not significant (P > 0.05). On the basis of quadratic polynomial fitting of the relationship between salinity levels and the specific growth rate, feed coefficient, and protein efficiency ratio, it was concluded that 25.36 - 25.9 is the most suitable salinity range for the growth performance of P. aibuhitensis. The main body composition (moisture, crude fat, crude protein, and ash content) was measured at different salinity levels. The results indicated that, with the increase in salinity, the moisture content of P. aibuhitensis decreased gradually; in contrast, the ash content increased gradually, as the salinity level increased. However, in the salinity range of 18 to 33, the difference in ash content was not significant (P > 0.05). Salinity had a significant influence on the crude protein content (P < 0.05), while it had no significant influence on crude body fat. Crude protein showed an increasing trend with the salinity increasing from 9 to 24, and decreased with the salinity increasing from 24 to 33. Antioxidant indexes such as superoxide dismutase, catalase, glutathione, and malondialdehyde (MDA) were analyzed, showing that in vivo MDA content was as low as the antioxidant activity at the salinity level of 24; this means low in vivo contents of active oxygen free radicals and excellent growth performance. This conclusion is consistent with that for other growth indexes. The total nitrogen content of the substrate in which the P. aibuhitensis specimens were cultured for 60 days was higher than the total nitrogen in the soil. With an increase in salinity, the total nitrogen content first decreased and then increased, and the lowest value was observed at the salinity level of about 24.

Keywords: Perinereis aibuhitensis, Growth Performance, Body Composition, Antioxidant, Total Nitrogen Content, Substrate

Cite this paper: Lv, F. , Nie, Q. , Yu, Y. , Liu, F. , Lv, L. and Zhao, W. (2017) Effect of Salinity on the Growth Performance, Body Composition, Antioxidant Indexes of Perinereis aibuhitensis and Total Nitrogen in the Substrate. Agricultural Sciences, 8, 1239-1252. doi: 10.4236/as.2017.811089.

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