Title: Effects of canola protein concentrate on growth of Atlantic salmon Salmo salar Authors
Submitted to: Aquaculture America Conference
Publication Type: Abstract Only
Publication Acceptance Date: September 2, 2009
Publication Date: March 3, 2010
Citation: Burr, G.S., Barrows, F., Wolters, W.R. 2010. Effects of canola protein concentrate on growth of Atlantic salmon Salmo salar. Aquaculture America Conference. p. 314. Technical Abstract: Atlantic salmon (Salmo salar) is an important aquaculture species with 9400 MT produced in 2005. Atlantic salmon is a carnivorous species that does not tolerate high levels of plant feed ingredients in the diet. New sources of protein must be found for the continued growth of the salmon industry. A 38-week feeding trial was conducted at the National Cold Water Marine Aquaculture Center (Franklin, ME) with juvenile Atlantic salmon to evaluate canola protein concentrate. A commercial diet (Signature Salmon 3.5 mm, Northeast Nutrition, Truro, Nova Scotia) was used and modified by the manufacturer to contain 10 or 20% canola protein concentrate replacing fishmeal and poultry by-product meal. The three diets were formulated to contain 48% protein, and 21% lipid. Diets were manufactured and analyzed by the commercial feed producer. Each experimental diet was randomly assigned to triplicate tanks containing 20 Atlantic salmon with an initial weight of 133.0 +/- 7.8g per fish. The fish were stocked into nine 0.265 m3 tanks connected to a common drum filter and biological filter to maintain optimal water quality. Water in the system was brackish water (3 ‰) from a ground source, and temperature (7.5 to 14 deg C) and dissolved oxygen were monitored continuously and ammonia, nitrite, nitrate, carbon dioxide, and pH were monitored weekly. Fish fed 20% canola protein concentrate had significantly lower growth compared with the fishmeal diet (p=0.0385). There was not any significant difference in feed efficiency (p=0.2170) or protein efficiency ratio (p=0.2081). Canola protein concentrate significantly depressed growth when included in the diet at 20%.