title: The effect of a flaxseed oil-enhanced diet on the product quality of farmed brook trout (Salvelinus fontinalis) fillets.
abstract: The effects of dietary modification with flaxseed oil-enhanced (Flax) feed on the product quality of brook trout fillets were examined. Trout were fed a commercial feed supplemented with fish oil (CD) or flaxseed oil (Flax) for 165 d before harvesting. Proximate composition and fatty acid profile were determined on fillets. Quality parameters of the raw fillets were examined over the storage period by measuring color (L*, a*, b*), muscle pH, and thiobarbituric acid reactive substances test. Evaluations on the cooked fillets included sensory evaluation with triangle tests and a paired preference test. There were no differences in proximate composition between the groups; however, the total omega-3 fatty acids were greater in Flax fillets (P<0.05). Diet and day were shown to interact in their effect on whiteness, pH, and lipid oxidation (P<0.05); however, linear regression did not determine that malondialdehyde concentration was associated with time in either diet type implying that lipid oxidation in the vacuum-packed fish was controlled at storage temperatures (4°C). Sensory panelists were able to choose the odd sample in a replicated triangle test analyzed using the β-binomial model, and there was preference for Flax fillets (P<0.05). Results indicate that a Flax-enhanced diet would have favorable effects on product quality of farmed brook trout.
authors.affiliation: West Virginia University, Animal and Nutritional Sciences, PO Box 6108, Morgantown, WV 26505, USA.
authors.forename: Courtney A
authors.initials: CA
authors.lastname: Simmons
authors.forename: Philip
authors.initials: P
authors.lastname: Turk
authors.forename: Sarah
authors.initials: S
authors.lastname: Beamer
authors.forename: Jacek
authors.initials: J
authors.lastname: Jaczynski
authors.forename: Kenneth
authors.initials: K
authors.lastname: Semmens
authors.forename: Kristen E
authors.initials: KE
authors.lastname: Matak
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000818:Animals; D017756:Aquaculture; D003116:Color; D015525:Fatty Acids, Omega-3 / Q000008:administration & dosage / Q000032:analysis; D005395:Fish Oils / Q000008:administration & dosage; D005511:Food Handling; D005518:Food Preferences; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008043:Linseed Oil / Q000008:administration & dosage*; D008315:Malondialdehyde / Q000032:analysis; D010084:Oxidation-Reduction; D011786:Quality Control; D011897:Random Allocation; D017747:Seafood / Q000032:analysis*; D012677:Sensation; D013649:Taste; D014337:Trout
chemical_list: D015525:Fatty Acids, Omega-3; D005395:Fish Oils; D008315:Malondialdehyde; D008043:Linseed Oil