In this study, the effect of different ultrasound powers treatment (200 W/L, 300 W/L, 500 W/L) on the chemical, microbiological and physical quality parameters of sardine fillets (Sardina pilchardus W.,1972) packed in vacuum packaging were investigated. The determination of quality parameters were studied to be performed by using pH, TVB-N, TBAR's analyses and various microbiological analyses and by evaluating texture properties and water activity changes in 0, 2, 4, 6, 8, 10, 12, and 14th day of storage. Consequently, it was observed to use of 200 W/L ultrasound delayed microbial spoilage and gave better results compared to the other groups in terms of hardness of product (P <0.05). The fact that use of ultrasound technology in seafood didn't effect negatively connective tissue of product and had positive effect on microbial load show that this technology can be developed and used in seafood.
The study aims to determine the reproductive cycle, the condition index, meat yield, shell component index, shell thickness index and gonad index of bivalve Donax trunculus inhabiting the Kefken-Babalı location on the Black Sea in relation to environmental parameters between November 2013 and October 2014. Its gonadal development began in November. D. trunculus was in the inactive stage during autumn. Spawning was observed from May (18°C) to August (28°C). Sex ratios were not equal and number of males was higher during the study period (1.13:1) with one hermaphrodite individual only. Being synchronous between sexes based on histological analysis, the reproductive cycle consists of six stages. The study showed that the most ideal period to harvest of D. trunculus was between December and May, especially when the meat yield and condition index were determined to be highest.
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