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| Effects of Two Culture Water Types on Muscle Nutrients and Physiological Indices of Pikeperch Sander lucioperca |
| GAO Jiamin1,2, LU Cuiyun2, SUN Zhipeng2, LIU Tianqi2, ZHANG Kexin2, NA Rongbin2, LIANG Shuang1, ZHENG Xianhu1,2 |
1. Tianjin Agricultural University, Tianjin 300384, China;
2. Key Laboratory of Freshwater Aquatic Biotechnology and Breeding, Ministry of Agriculture and Rural Affairs, Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China |
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Abstract To investigate the effects of medium alkalinity and freshwater aquaculture water on the muscular nutrient composition and some physiological parameters of pikeperch Sander lucioperca, 2000 juvenile pikeperch with body length of 5—7 cm were cultured in ponds (667 m2) with total alkalinity of 20—30 mmol/L in Lianhuan Lake area of Daqing City, Heilongjiang Province (medium alkalinity group) and freshwater ponds at Hulan Experimental Field of Heilongjiang River Fisheries Research Institute (freshwater group) for 2 months. The muscular nutrient composition and the contents of acid phosphatase (ACP), alkaline phosphatase(AKP), superoxide dismutase (SOD)and ammonia were determined in gills, liver and intestine of the pikeperch. The results showed that there was no significant difference in crude protein and crude fat contents between the medium alkalinity water and freshwater groups (P>0.05). However, the essential amino acid (EAA) / total amino acid (TAA) and EAA/non-essential amino acid (NEAA) were found to be higher in the medium alkalinity water group than those in the freshwater group, with the ideal profile for high-quality protein as recommended by the WHO/FAO. There was higher essential amino acid index EAAI (65.12) in muscle in the medium alkalinity water group than that in the freshwater group (61.00). The 19 kinds of fatty acid were detected, without significant difference in total saturated fatty acid (SFA), polyunsaturated fatty acid (PUFA), and monounsaturated fatty acid (MUFA) between the two groups (P>0.05). The levels of AKP and SOD in the gills were shown to be significantly lower in the medium alkalinity water group than those in the freshwater group, while the significantly higher ACP level in the medium alkalinity water group. The AKP content in the intestine was significantly lower in the medium alkalinity water group than that in the freshwater group (P<0.05), whereas the ammonia content was significantly higher in the medium alkalinity water group, without significant difference in the four immune-related physiological indicators in the liver between the two groups, indicating that the muscle amino acid content of pikeperch kept rich and balance in medium alkalinity water. The fatty acid composition was slightly affected by the medium alkalinity water, without immunoenzymatic indicators induced by immune stress response in pikeperch in medium alkalinity water. In conclusion, pikeperch can grow healthily in medium alkalinity condition, and the findings provide reference for promoting pikeperch farming in alkalinity water.
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Received: 01 July 2024
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