Effects of Rutilus kutum mortality on the Appearance and sensory acceptability by gillnetting

Rutilus kutum , one of the most important and valuable is the bony fishes of the Caspian Sea and the use of gill net fishing is one of numerous methods and the use of gill net fishing is one of the main ways that likely to more die the large number of fish during captured in net. In this study, sensory and the appearance changes white fishes after fishing by gillnetting was performed to determine two treatments of live fish caught (choking in the air), and treatment of dead fish caught (death in water) in 30 samples.  Color measurements on the skin and fillet, fillet texture analyzer machine and sensory evaluation was conducted for 12 days. The results showed that the amount of hue of color measurements the fillet, texture analysis factors in hardness and chewiness, texture and the appearance of gills and sensory evaluation parameters were significant differences (p<0/05)  between two treatments. Existence of a decreasing-increasing trend observed in the results of  colorimetry to be associated with enzymatic -microbial and changes in texture analysis with changes in the sarcomeres and adhesion between fibers.

This study showed that there is no significant difference in the appearance characteristics and skin color parameters, still the most important challenges ahead for consumers to distinguish and identify the dead fish caught with contraindicated to religious,However, with the passage of time and more attention to the gills appearance and tissue factors may be reduce the problem somewhat. Thus, The results of appearance and sensory properties showed that a more desirable at live fish caught than the dead fish captured.