EN
The samples of water, fish and of the sea bottom residuals taken in years 1982, 1985, 1987 and 1988 from the Baltic were assessed for the presence of Pseudomonas spp. and gram-negative non-fermentative bacterial strains. A total of 361 strains was isolated from fish, i.e. 224 strains from diseased fish, 137 from normal fish and in addition 176 from water and 214 from residuals of the sea bottom. A total of 751 strains was examined biochemically. From fish most often there were isolated: Ps. aeruginosa (30 strains), Ps. fluorescens (21), Ps. alcaligenes (18), Ps. pseudoalcaligenes (7), Ps. testosteroni (4), Ps. cepacia (1), A. calcoaceticus lwoffi (6) and A. calcoaceticus alcaligenes (4). From water and residuals of the sea bottom apart from the above baceria there were noted mostly Ps. putrefaciens (7 and 4 respectively), Ps. diminuta (7), Ps. stutzeri (3), Ps. vesicularis (3) and M. osloensis (8). It was found that the strains under study were identical or very similar to those isolated from human and animals.