Classification of Bacteria based on Environmental factors;
Psychrophiles – Bacteria which grow at a temperature of 0- 20°C with an optimum at 15°C. eg. Pseudomonas.
Mesophiles – Bacteria which survive at a temperature of 20- 45°C with an optimum growth at 30 – 37°C. eg. Salmonella typhi.
Thermophiles – Bacteria which survive at a temperature of 45- 90°C with an optimum growth at 55°C. eg. Clostridium botulinum.
Halophilic – Bacteria which grow best in the presence of salt. eg. Serratea salinaria.
Halophobic – Bacteria which cannot tolerate salt concentrations higher than 6%. eg. Achromobacter, Pseudomonas.
Acidophiles – Bacteria which can survive at a pH of 4.5 and below. eg. Lactic acid bacteria.
Aerobic – Bacteria which grow only in the presence of air. eg. Salmonella typhi.
Anaerobic – Bacteria which grow only in the absence of oxygen eg. Clostridium sp.
Autotrophs – Bacteria which can synthesis their own food material. eg. Green sulphur bacteria.
Heterotrophs – Bacteria which depends on others for their food. eg. Vibrio cholera.
FISH PROCESSING TECHNOLOGY (2005)
State Council of Educational Research & Training (SCERT)
Vidyabhavan, Poojappura, Thriuvananthapuram-12, Kerala