Dietary calcium requirement of red swamp crayfish (Procambarus clarkia). (8th October 2020)

• Record Type: Journal Article
• Authors: Xu, Lei; Tian, Juan; Wen, Hua; Wu, Fan; Zhang, Wenbing; Gao, Weihua; Chen, Xiaoru
• Is Part Of: Aquaculture nutrition. Volume 27:Number 1(2021)
• Page Start: 153
• Page End: 162
• Publication Date: 2020-10-08
• Subjects: calcium -- growth -- Procambarus clarkia -- serum biochemical indices; Aquaculture -- Periodicals; Aquatic animals -- Feeding and feeds -- Periodicals; Fishes -- Feeding and feeds -- Periodicals; 639.3
• DOI: 10.1111/anu.13173
• Languages: English
• ISSNs: 1353-5773

Abstract

Abstract: 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.