Open AccessDietary zinc requirement of juvenile grass carp ( C tenopharyngodon idella ) based on growth and mineralization
Author(s) -
LIANG J.J.,
YANG H.J.,
LIU Y.J.,
TIAN L.X.,
LIANG G.Y.
Publication year - 2012
Publication title -
aquaculture nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.941
H-Index - 79
eISSN - 1365-2095
pISSN - 1353-5773
DOI - 10.1111/j.1365-2095.2011.00935.x
Subject(s) - grass carp , zoology , mineralization (soil science) , biology , alkaline phosphatase , zinc , carp , juvenile , feed conversion ratio , body weight , medicine , endocrinology , chemistry , fishery , biochemistry , fish <actinopterygii> , ecology , enzyme , soil water , organic chemistry
A growth trial was conducted to estimate the optimum requirement of dietary zinc ( Z n) for grass carp ( C tenopharyngodon idella ). Triplicate groups of grass carp (3.97 ± 0.05 g) were fed diets containing graded levels (13, 25, 34, 53, 89 and 135 mg kg −1 ) of Z n for 8 weeks. Grass carp fed with dietary Z n levels higher than 34 mg kg −1 significantly increased final body weight, weight gain and specific growth rate ( P < 0.05). For body composition, fish fed with dietary Z n levels higher than 53 mg kg −1 significantly decreased the moisture contents but increased the lipid contents of whole body and liver. Whole body, scales, vertebrae and liver mineralization were all affected significantly ( P < 0.05) by dietary Z n levels. Z n contents in whole body, scales, vertebrae and plasma were linearly increased up to the 53 mg kg −1 dietary Z n and then remained stable beyond this level. Grass carp fed with dietary Z n levels higher than 53 mg kg −1 significantly increased triacyglyceride and total cholesterol contents and plasma alkaline phosphatase activity in plasma ( P < 0.05). Broken‐line analysis indicated that 55.1 mg kg −1 dietary Z n was required for maximal tissue storage and mineralization as well as optimal growth of grass carp.