Two groups of Gobiidae underwent physico-chemical and microbiological research with 5 specimen in each of them (a control group containing healthy fish and an experimental group-infested with nematodes E. excicus). Changes in moisture, fat and concentration of hydrogen ions were revealed. The results of microbiological research taken from Gobiidae muscular tissue impression smears from both control and experimental groups didn’t reveal any valuable changes. While conducting Bacteriological research of bacteria E. coli in control and experimental groups no trace of pathogenic microorganisms were found as well as salmonella S. аureus,
L. monocygenes. The quantity of mesole-aerobic and facultative anaerobic microorganisms equaled to 3,5×104 in both groups. Therefore, the research revealed high percentage of Gobiidae infestation with parasite E. еxcises (the intensity of invasion was 67%) which first of all tampers with quality of material. Because of the fact that all the revealed parasites were alive, consuming this fish could be dangerous. Further study as well as histological and chemical analysis are necessary although the intensity of fish infestation in 2 to 5 parasites didn’t alter bacteriological and physico-chemical indexes of quality.
Key words: Gobiidae, larvae of Eustrongylides exсisus, muscle tissue.