2014
DOI: 10.1016/j.aquaculture.2014.04.014
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Quantifying the dietary potassium requirement of juvenile grass carp (Ctenopharyngodon idellus)

Abstract: A growth trial lasting for 12 weeks was conducted in a semi flow-through system to determine the dietary potassium requirement of juvenile grass carp (Ctenopharyngodon idellus) with an initial body weight of 4.8 g. Seven isonitrogenous and isoenergetic semi-purified diets were compounded with different dietary potassium levels: 1. 50, 2.32, 3.28, 5.30, 7.12, 9.45 and 10.44 g kg −1 diet. The results showed that specific growth rate and feed efficiency of grass carp were significantly (P b 0.05) affected by diet… Show more

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Cited by 13 publications
(40 citation statements)
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“…In this study, fish fed basal diet (K 1 ) exhibited deficiency signs such as poor growth, decrease in gill Na + ‐K + ATPase activity and reduced potassium deposition in the whole‐body, vertebrae and scales (Tables –). Similar potassium deficiency signs were also reported in chinook salmon (reared in freshwater containing <1 mg K/L; Shearer, ), hybrid tilapia (reared in freshwater containing 1.08–3.62 mg K/L; Shiau & Hsieh, ), rainbow trout (Kalantarian et al, ) and grass carp (reared in freshwater containing 1.71–8.18 mg K/L, Liang et al, ; 1.86–3.10 mg K/L, Zhu et al, ; 6.86–9.10 mg K/L, Chen et al, ).…”
Section: Discussionsupporting
confidence: 66%
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“…In this study, fish fed basal diet (K 1 ) exhibited deficiency signs such as poor growth, decrease in gill Na + ‐K + ATPase activity and reduced potassium deposition in the whole‐body, vertebrae and scales (Tables –). Similar potassium deficiency signs were also reported in chinook salmon (reared in freshwater containing <1 mg K/L; Shearer, ), hybrid tilapia (reared in freshwater containing 1.08–3.62 mg K/L; Shiau & Hsieh, ), rainbow trout (Kalantarian et al, ) and grass carp (reared in freshwater containing 1.71–8.18 mg K/L, Liang et al, ; 1.86–3.10 mg K/L, Zhu et al, ; 6.86–9.10 mg K/L, Chen et al, ).…”
Section: Discussionsupporting
confidence: 66%
“…Analysed dietary potassium concentrations of 0.32 (basal diet), 1.35, 2.41, 3.46, 6.48, 9.47 and 12.39 g/kg were found in K 1 , K 2 , K 3 , K 4 , K 5 , K 6 and K 7 , respectively. Dietary potassium levels were fixed taking into consideration the requirements reported for grass carp (Chen et al, ; Liang et al, ; Zhu et al, ). Vitamin‐free casein and gelatin were used as dietary protein sources and dextrin as carbohydrate source to achieve the desired level of energy in experimental diets.…”
Section: Methodsmentioning
confidence: 99%
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“…Even rarer are studies considering the impacts of feeding when there is an ionic deficiency in the rearing medium. Fish reared in freshwater where [K + ] was low were shown to have some requirement for dietary K + [31,[36][37][38]. However, evidence that marine fish respond positively to dietary salts let alone dietary K + remains a point of conjecture, mostly because studies have been conducted in water bodies where [K + ] and the concentration of other ions was probably sufficient to meet their needs, e.g., [39].…”
Section: Introductionmentioning
confidence: 99%