Supplementing the feed of common carp (Cyprinus carpio L.) juveniles with the BIOSAF probiotic

Abstract

The studies determined the effect of carp feeds supplemented with the probiotic preparation BIOSAF, a concentrate of live yeast, Saccharomyces cerevisiae strain Sc 47, on the growth and food conversion ratio of carp juveniles. Four types of granulated experimental feeds were prepared; three contained different quantities of the BIOSAF probiotic (Bl – 0.5 g kg^-1; B2 – 1.0 g kg-1; B3 – 1.5 g kg^-1) and one was control feed K – without any probiotic. The added weight values of the probiotic were converted into colony forming units (CFU) of yeast, Saccharomyces cerevisiae, and were 4, 8, and 12 × 109 CFU, respectively, per kilogram of feed. During the 50-day growth test, the fish receiving feeds supplemented with the probiotic had significantly higher mean individual body weight (P <= 0.05) in comparison with the fish from the control group. The minimal value of specific growth rate throughout the test (l.98% d-1) was attained by fish fed control feed K, while the maximal value (2.45% d^-1) was recorded in the B2 variant; the differences were statistically significant. The most favorable values of food conversion and protein efficiency ratio were noted in the B2 feed. The differences were statistically different in comparison with the remaining feed types. No fish losses were recorded during the growth test. The type of feed had an impact on the contents of protein and fat in the fish bodies, but it did not cause any changes in dry mass or ash.

CORRESPONDING AUTHOR:

Dr inż. Jan Mazurkiewicz, Akademia Rolnicza im. Augusta Cieszkowskiego w Poznaniu, Katedra Rybactwa Śródlądowego i Akwakultury, ul. Wojska Polskiego 71c, 60-625 Poznań, Tel./Fax: +48 61 8487706; e-mail: karp@owl.au.poznan.pl