BIOTRANSFORMATION DES DECHETS DE POISSON PAR FERMENTATION CONTROLEE

HAMMOUMI  A.  FAID  M.  ZOUITEN A. et  AMAROUCH H.

ABSTRACT

Fish waste were mixed with 10 % cane molasses and inoculated with a starter culture made of Lactobacillus plantarum. The mixture was incubated at ambient  temperature (22°C). Changes in physico-chemical properties (pH, volatile nitrogen, non protein, trimethylamine and histamine) were monitored during a fermentation period of 15 days. Microbiological determinations were also carried out including standard plate count, coliforms, Clostridium, lipolytic and proteolytic microorganisms. Results indicated that the pH decreased considerably and remained constant at 4. The non protein nitrogen and total volatile nitrogen increased significantly. The trimethylamine decreased or remained constant at low levels depending on the initial value. The microbiological characteristics showed a rapid decrease of coliform and Clostridium counts to reach a low level after 5 to 7 days. Lipolytic and proteolytic microoganisms decreased notably during the fermentation and reached a minumun after 8 days and 5 days respectively.