Proteolysis by juvenile sea bass (Dicentrarchus labrax) gastrointestinal enzymes as a method for the evaluation of feed proteins

P. Lindner, A. Eshell, S. Kolkovski, A. Tandler, S. Harpaz

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Protein digestibility by gastrointestinal homogenates of Dicentrarchus labrax, was investigated in 5 feeds in relation to their amino acids composition and their ability to sustain growth of D. labrax post larval juveniles. Gastric proteolysis was found to contribute <25% of the total proteolytic capacity. Correlation was found between intestinal proteolytic capacity and the feed protein content of three pairs of amino acids. The sum of basic amino acids, arginine + lysine in the feed protein exhibited a positive correlation with susceptibility to proteolysis. The sum of the acid amino acids glycine and proline showed a negative correlation. Comparison of the intestinal proteolytic enzymatic activities in 3 growth stages of this species revealed similar profiles. Post larval and large juveniles had similar proteolytic capacities when compared on the basis of equal activity on an artificial substrate of Trypsin. Specific growth rates of post larval fish fed on these 5 feeds correlated positively with their protein digestibility as measured with large juvenile's intestinal homogenates. The results suggest that in this species, the efficiency of feeds in sustaining growth at the post larval stage can be estimated by measuring the feed protein digestibility by the proteolytic system of larger sized juveniles.

Original languageEnglish
Pages (from-to)399-407
Number of pages9
JournalFish Physiology and Biochemistry
Issue number5
StatePublished - 1 Oct 1995
Externally publishedYes


  • Dicentrarchus labrax
  • feeds
  • growth rate
  • post larvae
  • proteolytic enzymes

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Aquatic Science


Dive into the research topics of 'Proteolysis by juvenile sea bass (Dicentrarchus labrax) gastrointestinal enzymes as a method for the evaluation of feed proteins'. Together they form a unique fingerprint.

Cite this