Open AccessDietary available phosphorus requirement of crucian carp , Carassius auratus
Author(s) -
Sun Y.,
Li B.,
Zhang X.,
Chen M.,
Tang H.,
Yu X.
Publication year - 2018
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/anu.12686
Subject(s) - crucian carp , biology , zoology , alkaline phosphatase , carassius auratus , phosphorus , dietary protein , medicine , endocrinology , chemistry , biochemistry , fishery , fish <actinopterygii> , enzyme , organic chemistry
Abstract This study was carried out to evaluate the dietary available phosphorus ( AP ) requirement for crucian carp ( Carassius auratus ). Triplicate groups were fed diets containing five graded levels of AP in 15 recirculating tanks. After a 9‐week feeding experiment, weight gain ( WG ), specific growth rate ( SGR ), feed efficiency ( FE ) and whole‐body and vertebrae P contents were significantly increased as dietary AP increased from 1.1 to 7.6 g/kg ( p < .05) and then levelled off. N and P retention was also significantly increased as dietary AP increased to 5.5 g/kg ( p < .05). Condition factor, viscerosomatic index, hepatosomatic index, whole‐body moisture, muscle P content and plasma total cholesterol were not affected by dietary P levels ( p > .05). Protein and ash contents of the whole body increased linearly as the dietary P level increased, but the lipid content, plasma alkaline phosphatase activities and triacylglycerol contents showed an inverse relationship. Based on WG , FE , whole‐body P content and vertebrae P content, the optimum requirement of dietary AP for crucian carp was estimated to be 8.3, 8.3, 8.0 and 7.8 g/Kg, respectively.