Improved carp [Cyprinus carpio] diets based on plant protein sources reduce environmental phosphorus loading
2003
Jahan, P. (Tokyo Univ. of Fisheries (Japan)) | Watanabe, T. | Kiron, V. | Satoh, S.
ABSTRACT: As part of on-going efforts to reduce environmental phosphorus (P) and nitrogen (N) loading from culture systems, five experimental diets were formulated containing 5-15% of fish meal (FM) and different levels of soy protein concentrate (10-20%), corn gluten meal (3-5%) and defatted soybean meal (2.0-8.5%). These diets had total P ranging between 1.04 and 1.29% and available P between 0.62 and 0.63%. A FM-based (43%) commercial diet was used as the control and this diet had total P of 1.87% and available P of 0.82%. Waste loading was calculated after feeding the diets to 3.4 g carp for 10 weeks. Feed gain ratios were not significantly different for fish fed control and experimental diets having 10-15% FM, but the protein efficiency ratio was lower for the control group. The rates of P absorption and retention in the experimental diet groups were significantly higher than those of the control group. The lowest N retention was obtained for the control group, although absorption was not markedly different among the treatment groups. Total P and N loading (kg/ton production) produced from the experimental diets ranged from 7.1 to 8.9 and from 36.1 to 41.3, respectively, whereas the corresponding values for the control diet were 15.2 and 48.1.
Mostrar más [+] Menos [-]Palabras clave de AGROVOC
Información bibliográfica
Este registro bibliográfico ha sido proporcionado por Agriculture, Forestry and Fisheries Research Information Technology Center