Freshness is the main concern of seafood quality, and the principal method to evaluate seafood freshness is sensory evaluation. The aim of this work was to study the quality changes of cobia, Rachycentron canadum, under ice storage through sensory and physical analysis as well as bacterial counting of specific spoilage organisms (SSOs). In particular, the utilization of a quality index method (QIM) scheme was proposed. Samples stored for 0–30 d were analyzed with the QIM. Ten panelists observed and registered the changes occurring in the fish starting on day zero and ending when the fish were spoiled. After developing the scheme, 11 sensory attributes were described in 23 points, which detailed the appearance of skin, eyes, abdomen, gills, and flesh deterioration. The volatile nitrogen compound measurements and microbiological data of the SSOs determined a shelf‐life of 19 d for the samples. Sensory analysis showed a rejection point at 15.67 d of ice storage. The natural degradation of myofibrillar proteins and collagen was observed during ice storage. In conclusion, a shelf‐life of 15 d was defined for raw cobia stored on ice.
Summary
To ensure the marketing of fresh fish‐based products, it is necessary to develop fast methods that assess its freshness in real time. This study therefore evaluated the applicability of a photochromic time–temperature indicator (TTI) to monitor the time and temperature history during the period of validity of the whole fish of the cobia specimen stored in ice. The TTI response was both visibly interpreted as well as adaptable to measurement using suitable equipment. The results showed that the smart indicator activated during 6 s of ultraviolet light showed a similar rate of deterioration of the analysed product visual response, proving to be a dynamic shelf life indicator that can assure consumers the ultimate quality point of the entire cobia easily, cheaply and accurately.
O objetivo neste trabalho foi estudar a diversidade da ictiofauna capturada com a rede de emalhar mais utilizada no estado de Pernambuco. No total foram realizadas 14 coletas no Canal de Santa Cruz (CSC) entre os meses de julho de 2013 e junho de 2014. As amostras foram obtidas com rede de emalhar de malha de 30 mm. Os peixes capturados foram retirados e separados na posição margem e centro, e na posição vertical da rede (superior, meio e inferior). Quanto à frequência de ocorrência, as espécies foram classificadas como comuns, acessórias ou ocasionais. Foram realizadas análises de diversidade alfa e beta. No total foram capturadas 19 espécies, sendo Opisthonema oglinum e Anchovia clupeoides as únicas constantes. As diversidades alfa estimadas não apresentaram diferenças significativas nos estratos temporais e espaciais. Na diversidade beta dois grupos se distinguiram, sendo que no maior ocorreu geralmente grandes abundâncias de O. oglinum. A rede avaliada foi eficiente para a espécie alvo O. oglinum e as capturas de outras espécies corresponderam a menos de 13% da icitiofauna já encontrada no CSC. Portanto, medidas de gestão que visem restringir o uso do petrecho para a proteção da diversidade, considerando a sazonalidade e espacialidade no canal, não são recomendadas.
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