Replacement of fishmeal by canola protein concentrate in diets fed to rainbow trout (Oncorhynchus mykiss)

• Published in: Aquaculture nutrition Vol. 10; no. 6; pp. 379 - 388
• Main Authors: Thiessen, D.L, Maenz, D.D, Newkirk, R.W, Classen, H.L, Drew, M.D
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Science Ltd 01.12.2004
• Subjects: animal growth; Brassica; canola meal; canola protein concentrate; corn gluten meal; digestibility; digestible protein; experimental diets; fish culture; fish feeding; fish meal; glucosinolates; Glycine max; growth; Oncorhynchus mykiss; phytic acid; rainbow trout; soybean meal; trout; Zea mays
• ISSN: 1353-5773; 1365-2095
• DOI: 10.1111/j.1365-2095.2004.00313.x

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.