Effect of reused water on growth index and survival rate of the Rainbow trout (Oncorhynchus mykiss)

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Abstract

This research was carried out to determine water reuse effects on growth indices of rainbow trout.
For this reason 4 groups including: Control (with use of 100% fresh water), Test 1(rearing with use of
30% recycled water (with physical filtration and 10% fresh water), Test 2 (using of 10% recycled
water (with physical filtration and 30% fresh water), Test 3(using of 100% recycled water) was done.
Fish stock of each groups were done with 62 fish in each square meter and average (±SD) weight
(15±1.5). The Growth index, SGR, CF, FCR, SR between different groups in each month was
calculated and determined. In this research comparing the average of monthly growth increasment
between different groups indicated that significant decrease of growth in test groups with control
group as well as groups 1 and 2 with 3 groups. There were no significant differences in this factor
between groups 1 and 2. FCR, SR and MR showed a significant difference between different groups.
These results showed with increasing the replacement of water in rainbow trout culture ponds with
recycled water cased significant decrease in SR and CF and significant increase in MR and finally
decrease in production and density per unit area.

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Iranian Scientific Fisheries Journal
Volume 21, Issue 4 - Serial Number 81
May and June 2013
Pages 115-124

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