TITLE:
Rearing Performance of Juvenile Brown Trout (Salmo trutta) Subjected to Exercise and Dietary Bioprocessed Soybean Meal
AUTHORS:
Jill M. Voorhees, Michael E. Barnes, Steven R. Chipps, Michael L. Brown
KEYWORDS:
Brown Trout, Salmo trutta, Bioprocessed Soybean Meal, Exercise, Diet
JOURNAL NAME:
Open Journal of Animal Sciences,
Vol.8 No.3,
July
13,
2018
ABSTRACT: This 121-day experiment evaluated the rearing
performance of brown trout Salmo trutta fed one of two isonitrogenous and isocaloric diets and reared at velocities of
either 2.8 or 16.1 cm/s. Fishmeal was the primary protein source for the
reference diet, and bioprocessed soybean meal replaced approximately 67% of the
fishmeal in the experimental diet. At the end of the experiment, there were no
significant differences in gain, percent gain, feed conversion rates, or
specific growth rates between the dietary treatments. There were also no
significant differences in intestinal morphology, splenosomatic, hepatosomatic,
and viscerosomatic indices related to diet composition. However, gain, percent
gain, feed fed, and specific growth rate were all significantly greater in
brown trout reared at the higher velocity. No significant differences in any of
the other variables measured were observed between the velocity treatments.
There were no significant interactions between diet and velocity in any of the
variables. Based on the results of this study, bioprocessed soybean meal can
replace at least 67% of the fishmeal in brown trout diets, regardless of the
rearing velocities used in this study. However, higher rearing velocities are
recommended to maximize juvenile brown trout growth rates.