The effect of the freezing-thawing process on fish quality

Abstract

The aim of this study was to determine the quality changes of anchovy (Engraulis engrasicholus, L. 1758) and bluefish (Pomatomus saltatrix, L. 1766) due to a multiple freezing-thawing process. The samples were stored in straphor plate at -30 degreesC and thawed in a refrigerator (+4 +/- 1 degreesC, 16 h). microwave (180 W. 15 m) and in running water (+21 +/- 1 degreesC, 2h) for 15 day periods. Sensory, pH, total volatile basic nitrogen (TVB-N) and trimethylamine nitrogen (TMA-N) analyses were performed. It was determined that the quality of samples thawed in water and a refrigerator decreased to the "spoiled" level after the 3th thawing process and the quality of samples thawed in a microwave spoiled after the 4th thawing process. However, consumption of the fish after the 1st thawing process is recommended.