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Growth, precocity, enzyme activity and chemical composition of juvenile Chinese mitten crab, E riocheir sinensis, fed different dietary protein‐to‐energy ratio diets
Author(s) -
Li Xiaowu,
Li Zhongjie,
Liu Jiashou,
Murphy Brian R.
Publication year - 2012
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.2011.02981.x
Subject(s) - biology , moulting , alkaline phosphatase , juvenile , eriocheir , zoology , protein efficiency ratio , growth rate , feed conversion ratio , composition (language) , dietary protein , endocrinology , medicine , enzyme , body weight , biochemistry , ecology , linguistics , philosophy , geometry , mathematics , larva
A growth experiment was conducted to determine the optimum dietary protein‐to‐energy (P/E) ratio of juvenile Chinese mitten crab E riocheir sinensis . Six practical diets were formulated with P/E ratios ranging from 15.94 to 21.25 g protein MJ −1 gross energy (g MJ −1 ). Results showed that specific growth rates related with molting were significantly affected by dietary P/E ratio ( P < 0.05). The specific growth rates both in body weight ( SGR w) and carapace width ( SGR cw) for the entire experimental period were not significantly affected by dietary P/E ratio ( P > 0.05). Molting frequency, survival rate and crab body composition were also significantly affected by dietary P/E ratio ( P < 0.05). Rate of precocity displayed negative trends with growth rate, and the trend with SGR cw was significant ( P < 0.01). The activities of alkaline phosphatase, trypsinase and steapsin were significantly affected by dietary P/E ratio ( P < 0.05). Molting frequency ( P < 0.001), SGR w1‐2 ( P < 0.05) and SGR w0‐2 ( P < 0.05) were positively and significantly related to alkaline phosphatase activity. We recommend 18.13–19.20 g MJ −1 as the optimum dietary P/E ratio for juvenile E . sinensis, based on growth performance, rate of precocity and digestive enzyme activities.