Journal
AQUACULTURE RESEARCH
Volume 46, Issue 12, Pages 2991-2998Publisher
WILEY
DOI: 10.1111/are.12455
Keywords
diet; grass carp (Ctenopharyngodon idella; Val; ); manganese requirement; growth performance; body composition; mineralization
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Funding
- National Natural Science Foundation of China [31172419/C190401]
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A growth trial was conducted to estimate the optimum concentration of dietary Manganese (Mn) for grass carp (Ctenopharyngodon idella). Triplicate groups of grass carp (3.97 +/- 0.05g) were fed diets containing graded levels (4.0, 8.9, 13.8, 18.7, 23.6 and 33.3mgkg(-1)) of Mn for 8weeks. Weight gain, specific growth rate and feed efficiency were linearly increased up to the 18.7mgkg(-1) dietary Mn and then levelled off beyond this level. For body composition, lipid contents in whole body, muscle and liver decreased significantly with increasing dietary Mn level. Grass carp fed with dietary Mn levels higher than 19.7mgkg(-1) significantly decreased condition factor. Whole body, vertebrae and scales mineralization were all affected significantly by dietary Mn levels. Mn contents in whole body, vertebrae and scales were linearly increased up to the 18.7mgkg(-1) dietary Mn and then levelled off beyond this level. Contrarily, Ca and P contents seem to be inversely related to dietary Mn. However, dietary Mn levels had no significant effect on body Fe contents. Broken-line analysis indicated that 20.6mgkg(-1) dietary Mn was required for maximal tissue Mn storage, as well as satisfied for the optimal growth of juvenile grass carp.
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