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Dietary potassium requirement of juvenile grass carp ( C tenopharyngodon idella Val.) based on growth and tissue potassium content
Author(s) -
Liang Jianjun,
Yang Huijun,
Liu Yongjian,
Tian LiXia
Publication year - 2014
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/are.12008
Subject(s) - grass carp , biology , zoology , potassium , juvenile , weight gain , feed conversion ratio , body weight , medicine , endocrinology , fish <actinopterygii> , fishery , chemistry , ecology , organic chemistry
A growth trial was conducted to estimate the optimum concentration of dietary potassium ( K ) for grass carp ( C tenopharyngodon idella ). Triplicate groups of grass carp (3.96 ± 0.06 g) were fed diets containing graded levels (0.87, 2.90, 5.37, 7.54, 9.87 and 12.4 g kg −1 ) of K for 8 weeks. Final body weight, weight gain and feed efficiency and gill Na + ‐ K + ATP ase activity were highest in fish fed with 9.87 g kg −1 dietary K and lowest in fish fed the basal diet ( P < 0.05). The K contents in whole body and muscle were linearly increased up to the 9.87 g kg −1 dietary K and then levelled off beyond this level, whereas in scales and vertebrae up to the 7.54 g kg −1 dietary K ( P < 0.05). However, dietary K levels had no significant effect on ash, Ca , P and Mg contents in whole body, scales, vertebrae or muscle. Analysis using polynomial regression of weight gain and gill Na + ‐ K + ATP ase activity and using the broken‐line regression of whole body K concentrations indicated that the adequate dietary K concentration for grass carp is about 9.45–9.99 g kg −1 diet.