The Effect of Storage Temperature on Microbiological Quality of Fish Feeds
I. Zmysłowska, D. Lewandowska
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University of Agriculture and Technology in Olsztyn, Faculty of Environment Protection and Fisheries, Department of Environmental Microbiology, 10-957 Olsztyn, ul. Prawocheńskiego 1, Poland
Pol. J. Environ. Stud. 2000;9(3):223–226
Temperature is a factor which affects microbiological quality of feeds during their storage. Three storage temperatures of the feeds for fish were taken into account in this study: -11°C, 5°C and 20°C. Analyses comprised survival of proteolytic, ammonifying, psychrophilic and mesophilic bacteria as well as fungi. It was found that after 72-day storage of fish feed in the three temperatures, fungi showed the highest survival (56 % - 80 %). As regards the four physiological groups of bacteria, the highest survival was observed for mesophilic bacteria (6.25 % - 9.58 %), followed by psychrophilic ones (2.5 - 3.25 %) and ammonifiers (0.07 - 0.11 %), while proteolytic bacteria showed the lowest survival (0 %). No live cells of the latter bacteria were observed after 64-day storage of the feed in -11 and 5°C, and after 72-day storage in 20°C.