Abstract:
The present study investigated the effects of propolis
and vitamin E supplementation in diets of juvenile
rainbow trout subjected to two different flow
rates (0.9 and 2.1 L min
1) on growth performance,
and vitamin A, C and E concentrations in
tissues as well as malondialdehyde (MDA) levels.
Juvenile rainbow trout were fed with diets containing
10 and 30 g propolis kg
1, 60mg kg 1
vitamin E (Rovimix E-50 adsorbate; min.%50 dla-
tokopherly acetate) and without supplemented
basal diet for 12 weeks. Weight gain (WG) in the
C group was significantly lower (P < 0.05) than
P10, P30 and E60 groups at both flow rate treatments.
At 2.1 L min
1, specific growth rate (SGR)
in the C group was significantly lower (P < 0.05)
than other groups, but at 0.9 L min
1, SGR of fish
did not differ among the diets groups (P > 0.05).
Survival rate (SUR) was higher in propolis and
vitamin E supplemented diet groups (P < 0.05)
than control diet group at 0.9 L min
1. Fish fed
on diet E60 had higher (P < 0.05) tissue vitamin
E concentration than fishes fed on other diets
groups. Vitamin C concentration in rainbow trout
tissues was significantly affected by the 30 g propolis
supplemented diet group (P < 0.05), followed
by the 10 g propolis supplemented diet group
(P < 0.05). MDA level of E60 group was found
significantly decreased instead of different than
other groups (P < 0.05). The results of Student’s
t-test revealed that WG, SGR, SUR values, vitamin
(A, C, E) concentrations and MDA levels of tissues
were negatively affected by 0.9 L min
1flow rate
treatment in juvenile rainbow trout.
