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Rapid compositional analysis of Atlantic salmon ( Salmo salar ) using visible‐near infrared reflectance spectroscopy
Author(s) -
Brown Malcolm R,
Kube Peter D,
Taylor Richard S,
Elliott Nick G
Publication year - 2014
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12021
Subject(s) - salmo , astaxanthin , biology , docosahexaenoic acid , polyunsaturated fatty acid , flesh , fatty acid , fish <actinopterygii> , fishery , food science , zoology , carotenoid , biochemistry
Rapid measurement of salmon flesh quality parameters (>400 samples day −1 ) was demonstrated in the laboratory and remotely at industrial sites. Visible‐near infrared spectroscopy ( VNIRS ) was applied to predict astaxanthin ( AX ) and fat content in farmed Atlantic salmon. Fish were sampled from thirteen batches (1–6 kg whole weight, containing 2.3–16.3% fat and 1.2–12.5 μg g −1 AX ), and models validated on small (average ± SD : 1.4 ± 0.4 kg) and large fish (4.2 ± 0.9 kg). Both constituents were well predicted in minced Norwegian Quality Cutlet ( NQC ) samples (r 2 ≥ 0.86; standard error of prediction ( SEP ) ≤0.7% for fat and ≤0.7 μg g −1 for AX ). Comparable metrics were observed for AX prediction in whole NQC s (r 2 = 0.80–0.88; SEP 0.7 μg g −1 ). Fat was better predicted in small fish than large fish for whole NQC s (r 2 = 0.82, SEP 1.0% cf r 2 = 0.59, SEP = 0.59%) and non‐destructive scanning through the skin of whole, gutted fish (r 2 = 0.77, SEP = 1.2% cf r 2 = 0.49, SEP = 1.5%). Models were also developed for screening polyunsaturated fatty acid ( PUFA ) concentrations, e.g. in NQC s for docosahexaenoic acid (r 2 = 0.73) and n‐3:n‐6 PUFA (r 2 = 0.89).