Sensory analysis has been used to to detect changes in the degree of tilapia freshness during the 12 hour storage period. This research was conducted in March 2017 until aJuly 2017. This research was conducted at Food Laboratory of PDD Polinela of Banyuasin Regency. The research method used is the experimental method (Explanatory Research). The data were processed using Friedman Conover and analyzed descriptively. The quality of fish can be grouped into several categories namely high quality, good quality, limit of acceptability and spoilt. The results showed the longer the time of retreat the quality of fish Tilapia was alight. High quality category has a gill color score of 8.40, texture 7.64 and aroma 7.76. Good quality category has a gill color score of 6.44, texture of 6.76 and aroma of 5.24. The limit of acceptability category has a gill color score of 4.72, a texture of 4.56 and a scent of 5.24. The spoiled category has a gill color score of 4.72, 3.16 texture and 2.44 odor.

The quality of fresh fish will decrease immediately after death. One of the indicators of fish quality is the changes of the gills color. The aim of this research was to determine the changes of red color in the gills of tilapia using image processing as an indicator of fish freshness. The research method used is the Explanatory Research where the independent variable (x) is tilapia which stored at room temperature for 12 hours. The dependent variable (y) was the intensity value of red. The quality of fish could be grouped into several categories, such as high quality, good quality, limit of acceptability and spoilt. The Observation was carried out with a time of 0 hours to 12 hours (4 hour interval). The results showed that storage time affected the deterioration of fresh quality. The high quality category has a red percentage value of 82.18%. Fresh category has a red percentage value of 67.10%. The limit of acceptability category has a value of 38.52% and the spoiltcategory has a red percentage value of 9.92%.