Dietary calcium requirement of red swamp crayfish (Procambarus clarkia)

文献类型： 外文期刊

第一作者： Xu, Lei

作者： Xu, Lei;Zhang, Wenbing;Gao, Weihua;Xu, Lei;Tian, Juan;Wen, Hua;Wu, Fan;Chen, Xiaoru

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关键词： calcium; growth; Procambarus clarkia; serum biochemical indices

期刊名称：AQUACULTURE NUTRITION （ 影响因子：3.497； 五年影响因子：3.78 ）

ISSN： 1353-5773

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收录情况： SCI

摘要： To investigate dietary calcium requirement of red swamp crayfish (Procambarus clarkia), six semi-purified diets were formulated to contain different concentrations of calcium (2.7(control group), 6.1, 11.9, 17.6, 23.5 and 29.1 g/kg calcium). Each diet was hand-fed to triplicate of 15 crayfish with average initial body weight (6.22 +/- 0.87) g for 8 weeks. The results showed that weight gain rate (WGR) significantly increased and feed conversion ratio (FCR) significantly decreased from 11.9 to 23.5 g/kg groups (p < .05). Protease activities in intestine and hepatopancreas and parathyroid hormone concentrations in serum significantly decreased with increasing dietary calcium levels (p < .05), while calcium and phosphorus contents in exoskeleton, calcium content in muscle and calcitonin concentrations in serum significantly increased (p < .05). The activities of lipase and amylase in intestine and hepatopancreas, serum alkaline phosphatase and total vitamin D concentrations in serum had significant increase as dietary calcium content increased up to 11.9-17.6 g/kg (p < .05). The inorganic phosphorus content in 29.1 g/kg group was significantly lower than those in other groups (p < .05). Broken-line model analysis based on WGR and quadratic curve model analysis based on FCR showed that optimal dietary calcium requirement of red swamp crayfish ranged from 12.7 to 17.1 g/kg.

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