Effects of dietary Betaine on growth, survival, body composition and resistance of fry rainbow trout (Oncorhynchus mykiss) under environmental stress

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Abstract

A four-week trial was conducted to evaluate the effects of different levels of dietary
Betaine on growth, survival and resistance to salinity (35ppt), temperature (24 C), hypoxia
and high and low pH stresses in rainbow trout (Oncorhynchus mykiss). Four levels of Betaine
as 0 (control), 0.4% (B0.4), 0.8% (B0.8) and 1.2% (B1.2) were used with three replicates. Forty
fish (0.67±0.15g) were stocked in each replicate and fed at 4-4.5% of body weight, five times
daily. Results showed that there were significant differences in growth, survival, NPU, PER
and FCR between B0.4, B1.2 and control diet (P0.05). Resistances to high and low pH (10.8 & 3.8) and to high temperature
(24 C) were significantly better in fish fed with Betaine containing diets compared to the
control diet. Resistance to high salinity in B0.4 was significantly better than the control diet
and resistance to hypoxia in diet B0.8 was significantly better than the control (P

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Iranian Scientific Fisheries Journal
Volume 20, Issue 1
September and October 2011
Pages 135-146

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