Microbiological evaluation of water and digestive tract contents of tench (Tinca tinca L.) during tank rearing

Abstract

Microbiological studies of tank water at three temperatures, and of tench (Tinca tinca L.) digestive tract contents were carried out. Analyses of water included quantitative evaluation of bacteria indicatory of sanitary state: the genera Pseudomonas, Aeromonas and Acinetobacter, and fungi. Studies of tench digestive tract contents involved quantitative evaluation of bacteria indicatory of water pollution, coliforms, and qualitative analyses of coliforms, fecal coliforms, fecal streptococci, bacteria from Pseudomonas, Aeromonas and Acinetobacter genera, and fungi. Bacteria indicatory of pollution and sanitary state i.e. Pseudomonas, Aeromonas, Acinetobacter, and fungi found in water were usually also present in the fish digestive tract contents. Heterotrophic bacteria grown on standard agar medium in 20°C and 37°C, and coliforms reached from 7.3 x 103 to 3.1 x 104, from 1.25 x 103 to 8 x 103, and from 0.78 x 103 to 3.3 x 103 cells per 1 g of fish digestive tract content respectively.