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Effect of growth rate on quality traits and feed utilisation of rainbow trout (Oncorhynchus mykiss) and brook trout (Salvelinus fontinalis)



Effect of growth rate on quality traits and feed utilisation of rainbow trout (Oncorhynchus mykiss) and brook trout (Salvelinus fontinalis)



Aquaculture 184(3/4): 327-337



Rainbow trout (Oncorhynchus mykiss) of initial average weight 150 g and brook trout (Salvelinus fontinalis) initially weighing 124 g on average, were reared at different growth rates by feeding either a high (H, close to satiation) or low (L, half of H) ration of a commercial diet. Fish were reared for 6 to 15 weeks in order to reach same size class. Fast growth increased whole body lipid and dry matter (P < 0.01) but reduced ash in both species (P < 0.01). Brook trout were both more fat and had higher protein content, lower moisture and lower ash content than the rainbow trout (P < 0.01). Neither the feed conversion ratio (FCR = g feed intake (.) g weight increase(-1)) nor protein retention efficiency (PRE) was affected by growth rate. The brook trout, however, were more efficient in retaining protein than the rainbow trout (P < 0.01). Enhanced growth increased fat content in fillets (P < 0.01). Like in whole body protein and dry matter was higher (P < 0.01) in brook trout fillets than in fillets from rainbow trout. Carcass percentage was in overall lower (P < 0.01) at high growth rates compared to slow growth while both carcass percentage (P < 0.01) and fillet yield (P < 0.01) was lower in brook trout than in rainbow trout.

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Accession: 003418067

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DOI: 10.1016/s0044-8486(99)00324-5


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