Abstract

The aim of the present study was to evaluate whether two dried and autoclaved single-cell bacterial protein sources (SCP) derived from Brevibacterium lactofermentum (PL) and Bacterium glutamaticum (PR) could partially replace fish meal on an available protein basis in diets for adult rainbow trout. In two experiments, 0, 4, 8 or 16% of the diet consisted of each source of bacterial protein by replacement of fish meal. The dietary level of PL (4-16%) did not significantly influence specific growth rate, feed efficiency, carcass yield, hepatosomatic index and gonadosomatic index. Similarly, 4% PR in the diet did not influence any of the foregoing performance parameters. However, higher dietary levels of PR caused a marked reduction in growth rate and feed efficiency. Since the fish on all diets ingested roughly the same amount of feed containing PL and PR, it is possible that PR was less digestible than PL and/or that PR had a toxic/antinutritional effect on the fish. There were no differences in either amino acid or fatty acid composition of the diets. Our results suggest that PL may comprise greater-than-or-equal-to 16% of the diet for rainbow trout by replacement of fish meal whereas caution should be exercised in the use of PR until further investigations are conducted.

Published in

Aquaculture
1992, Volume: 109, number: 2, pages: 119-130
Publisher: ELSEVIER SCIENCE BV

SLU Authors

• Kiessling, Anders

  • Department of Applied Animal Science and Welfare, Swedish University of Agricultural Sciences
    
  • Department of Aquaculture, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Fish and Aquacultural Science


Publication identifier

DOI: https://doi.org/10.1016/0044-8486(93)90209-H

Permanent link to this page (URI)

https://res.slu.se/id/publ/80457