Evolution des activités enzymatiques dans le tube digestif au cours de la vie larvaire du bar (Dicentrarchus labrax). Variations des protéinogrammes et des zymogrammes

The development of the digestive sYstem of larvae of Dicentrarchus Labarx has been studied. The changes in activities of digestive enzymes from hatching to 30 days have been investigated. 8 activities have been recorded : esterases, a-glucosidase, tryPsin, chymotrypsin, leucinaminopeptidase, alkalin and acid phosphatase, using polyacrylamid gel electrophoresis. All the activities are very weak at hatching ; the activities of trypsin, a-glucosidase, alkalin phosphatase increase between 0 and 5 days, decrease slowly and are quite stable from 15 to 30 days. The other activities increase steadily from 0 to 20 days. Relationships between the developmental : process Of the digestive system and changes in activities are investigated.