Authors contributed equally to this work.
Total fish meal replacement with canola protein isolate in diets fed to rainbow trout (Oncorhynchus mykiss W.)
Version of Record online: 17 JAN 2013
© 2013 John Wiley & Sons Ltd
Volume 19, Issue 4, pages 535–542, August 2013
How to Cite
Slawski, H., Nagel, F., Wysujack, K., Balke, D.T., Franz, P. and Schulz, C. (2013), Total fish meal replacement with canola protein isolate in diets fed to rainbow trout (Oncorhynchus mykiss W.). Aquaculture Nutrition, 19: 535–542. doi: 10.1111/anu.12005
- Issue online: 8 JUL 2013
- Version of Record online: 17 JAN 2013
- Manuscript Accepted: 30 JUL 2012
- Manuscript Received: 7 MAR 2012
- canola products;
- feed evaluation;
- growth trial;
- plant protein digestibility;
The potential of canola protein isolate (CPI) as fish meal alternative in diets for rainbow trout was evaluated. Apparent digestibility coefficients (ADCs) for protein from a fish meal-based reference diet (89.2 ± 1.1%) and CPI (84.6 ± 1.8%) were determined by indirect marker method in a digestibility experiment. ADC of dietary dry matter was slightly lower for the reference diet (62.5 ± 4.7%), but not significantly different to the CPI test diet (65.9 ± 3.1%). In a subsequent growth trial, 20 fish (initial weight 31.5 ± 0.5 g) were stocked into each of 15 experimental tanks of a freshwater flow-through system. Fish were organized in triplicate groups and received experimental diets with 0%, 25%, 50%, 75% and 100% of fish meal replaced with CPI on the basis of digestible protein (designated as Control, I25, I50, I75, I100 respectively). At the end of a 70-day feeding period, growth performance, feed intake and feed conversion ratio of treatment groups receiving diets I25, I50 or I100 were similar to the control group, while fish fed diet I75 showed significantly higher weight gain caused by improved feed conversion. The tested CPI was therefore identified to be a highly valuable fish meal alternative, not negatively affecting diet palatability, feed intake and feed efficiencies.