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Processing yield and chemical composition of rainbow trout (Oncorhynchus mykiss) with regard to body weight

Souza, Maria Luiza Rodrigues de; Macedo-Viegas, Elisabete Maria; Zuanon, Jener Alexandre Sampaio; Carvalho, Maria Regina Barbieri de; Goes, Elenice Souza dos Reis.
Acta sci., Anim. sci; 37(2): 103-108, 2015.
Artigo em Inglês | VETINDEX-Express | ID: vti-764442


The influence of weight (W) category of the rainbow trout on processing yield and chemical composition of the entire eviscerated fish and fish fillet was analyzed. A completely randomized design was employed for processing variables (W1 = 300 to 370 g and W2 = 371 to 440) coupled to a 2 x 2 factorial scheme for the chemical composition (W1 and W2 and forms of presentation: fillet and whole eviscerated fish). W1 showed higher yield for entire eviscerated fish (83.00%) and head (13.27%), but a lower yield for the viscera (17.00%), when compared to W2. We did not affect abdominal muscle yield, fillet with or without skin, skin percentage and residues. There were significant differences between W for moisture (W1 = 72.30% and W2 = 71.15%) and lipids (CP1 = 7.96% and CP2 = 9.04%) rates. Fillet moisture contents (73.74%) and crude protein (19.05%) were higher (p < 0.01) than for entire eviscerated fish (69.71% and 17.81%, respectively). Ash (2.15%) and lipid (10.48%) rates were higher (p < 0.01) for entire fish when compared to those of fillets (1.16% and 6.52%, respectively). The slaughter of fish weighing between 300 and 370 g and their fillets are more adequate for the market. 
Biblioteca responsável: BR68.1