| Popis: |
The effects of FinnStim (betaine plus 3% protein hydrolysate) on the osmotic balance, metabolism and growth in coho salmon Oncorhynchus kisutch (Walbaum) was studied. The fish were fed at levels of 3.5 to 5% of body weight per day with a commercial-type control diet or diet with 1% of FinnStim. The fish were fed experimental diets for 45 days in fresh water and 40 days in sea water; thereafter both groups were fed the control diet and monitored for additional 50 days. Fish weight, length and concentrations of main plasma ions Na + , Cl − did not differ significantly between treatments. FinnStim supplementation significantly decreased muscle K + load one week after SW transfer, and improved specific growth rate (SGR 1.75%/day vs. 1.66%/day) and FCR (1.27 vs. 1.51) in SW. During the whole trial period the FinnStim group showed lower mortality than the control group (2.78% vs. 4.95%). |
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