Psychrotrophic bacteria are bacteria
that are capable of surviving or even thriving in a cold environment. They can be found in soils
, in surface and deep sea waters
, and in foods
Psychrotrophic bacteria are of particular concern to the dairy industry
. Most are killed by pasteurization; however, they can be present in milk as post-pasteurization contaminants due to less than adequate sanitation practices. According to The Food Science Department at Cornell University, psychrotrophs are bacteria capable of growth at temperatures at or less than 7°C (44.6°F). At freezing temperatures, growth of pyschrotrophic bacteria becomes negligible or virtually stops.
[ Steven C. Murphy, "Shelf LIfe of Fluid Milk Products -- Microbial Spoilage", Food Science Department, Cornell University. Retrieved 22 November 2009. ]
Psychrotrophic bacteria also fall under the more general category of psychrophiles.