Open AccessReplacement of fishmeal by canola protein concentrate in diets fed to rainbow trout ( Oncorhynchus mykiss )
Author(s) -
Thiessen D.L.,
Maenz D.D.,
Newkirk R.W.,
Classen H.L.,
Drew M.D.
Publication year - 2004
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/j.1365-2095.2004.00313.x
Subject(s) - fish meal , canola , biology , corn gluten meal , rainbow trout , soybean meal , food science , dry matter , meat and bone meal , zoology , trout , meal , fishery , fish <actinopterygii> , ecology , raw material
Abstract A dephytinized protein concentrate prepared from canola seed (CPC) was assessed for nutrient digestibility and performance in rainbow trout ( Oncorhynchus mykiss ). The apparent digestibility coefficients of CPC were: dry matter, 817 g kg −1 ; crude protein, 899 g kg −1 ; gross energy, 861 g kg −1 ; arginine, 945 g kg −1 ; lysine, 935 g kg −1 ; methionine, 954 g kg −1 ; threonine, 893 g kg −1 . A 9‐week performance trial assessed 7 diets. Fishmeal provided 940 g kg −1 of the protein in the control diet. Test diets consisted of CPC or water‐washed CPC replacing 500 and 750 g kg −1 of fishmeal protein; and CPC plus an attractant replacing 500 and 750 g kg −1 of fishmeal protein. No significant differences in performance were observed ( P > 0.05). A subsequent 9‐week performance trial evaluated the effect of adding CPC into compound diets containing fishmeal/soybean meal/corn gluten meal. Five diets were prepared: fishmeal provided 670 g kg −1 of the protein in the control diet, in the remaining diets CPC was incorporated into commercial‐like trout diets at 100, 200 and 300 g kg −1 replacement of fishmeal protein, the fifth diet included an attractant in the 300 g kg −1 replacement diet. No significant differences in performance were obtained ( P > 0.05). These studies show that dephytinized canola protein concentrate has potential to replace substantial levels of fishmeal in diets for carnivorous fish without compromising performance.