Comparative analysis of food composition in red swamp crayfish(Procambarus clarkii)between two culture modes using carbon and nitrogen stable isotope techniques
In order to study the difference in food composition and feeding habits of red swamp crayfish(Procamba-rus clarkii)in co-culture mode of lotus root and crayfish and in intensive culture mode in Jiangsu Province,the carbon and nitrogen stable isotope values of red swamp crayfish,feed and common natural food were measured in the ponds of co-culture mode stocking with red swamp crayfish with body weight of 10.0 g at stocking density of 37.5 g/m2 and lotus root at planting density of 600 g/m2 and intensive culture mode stocking with red swamp cray-fish at stocking density of 60g/m2 during the breeding period,and the SIAR mixture model was used to calculate the contribution rate of different foods to the food of red swamp crayfish.The results showed that the isotope values were ranged from-30.81‰ to-20.54‰ for δ13C and 0.46‰ to 4.04‰ for δ15N in feed and natural food in the co--culture mode of lotus root and crayfish,and that-31.91‰ to-20.73‰ for δ13C and 2.33‰ to 8.05‰ for δ15N in feed and natural food in the intensive culture mode.The food sources were mainly Alternanthera philoxeroides(34.31％)and Nelumbo nucifeera(20.32％)in the co-culture mode of lotus root and crayfish,while the food sources were primarily formulated feed(30.08％)and Elodea nuttallii(18.69％)in the intensive culture mode.Red swamp crayfish prefers to feed aquatic plants in the co-culture mode of lotus root and crayfish,but mainly feeds feed in the intensive culture mode.The food source distribution of the co-culture mode of lotus root and cray-fish was shown to be more even than that in the intensive culture mode,with higher contribution rate of plant food than that in the intensive culture mode.
Procambarus clarkiifood compositionstable isotopelotus root and crayfish co-cultureintensive culture mode
万方数据
维普
