The blackspot seabream (Pagellus bogaraveo) is common along the continental shelf in the Southern European Atlantic Ocean and throughout the Mediterranean Sea, and has emerged as a potential candidate for European aquaculture ( Silva, Andrade, Timóteo, Rocha,
& Valente, 2006). From the marketing point of view, blackspot seabream is a species with a high, very stable value all year round, with an increasing demand and consequently higher value and sales just before Christmas ( Peleteiro, Olmedo, & Alvarez-Blázquez, 2000). The QIM is useful essentially because it evaluates sensory parameters and attributes that change most significantly in each fish species selleck inhibitor during degradation (Erkan and Özden, 2006 and Huidobro et al., 2000). The most commonly used attributes for seafood are appearance of eyes, skin and gills, together
with odour and texture (Sveinsdóttir, Hyldig, Martinsdóttir, Jorgensen, & Kristbergsson, 2003). When the linear correlation click here between Quality Index (QI) and storage time in ice is obtained, the total demerit scores may be used to readily predict the remaining shelf-life (Botta, 1995). Although the QIM is important in predicting the end of shelf-life or rejection time, it should be estimated with the help and support of other evaluation methods. Although the rejection point in QIM schemes can be estimated by sensory evaluation of the cooked muscle by a panel, for example using the Torry Scale (Martinsdóttir, 1997), this is typical of regions where fish is always commercially presented in fillets. In regions where fish is almost exclusively sold in the whole form, it doesn’t make sense the same procedure, as the rejection of the whole fish occurs always sooner than the rejection of the same fish in fillets (by evaluation of external characteristics, as done by consumers when buying), specially those obtained from whole fish stored in ice and filleted in the day of analysis (Barbosa, Staurosporine Bremner & Vaz-Pires, 2002, chap. 11). On the other hand, the consumption and transportation of seafood products is globally increasing (FAO, 2009) and this increases the need to
predict effects of storage and distribution conditions on product shelf-life (Dalgaard, 2000, p. 31). Due to the relatively poor correlation between counts of total numbers of bacteria over storage time, recently models based on enumeration of specific spoilage organisms (SSO) to determine the remaining shelf-life of fish products have been developed (Dalgaard, 2002, chap. 12; Olafsdóttir, Lauzon, Martinsdóttir, & Kristbergsson, 2006). The dielectric properties of fish skin and muscle are systematically altered during spoilage as tissue components degrade. Measurements of changes in dielectric properties can therefore be used for evaluations of the spoilage degree. Various instruments have been employed to measure physical properties of fish. The Torrymeter (Distell, 2007, p.