Study of increasing production in trout rearing farms with focusing on water aeration systems and water physical filtration aspect in west Azarbaigan Province

This research was carried out to determined water reuse effects on growth indices of rainbow trout. For this reason 4 groups includes: 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 weight (15±1.5).The Growth index, SGR, CF, FCR, SR between different groups in each month was calculated and determined. In this research comparison the average of month growth increment between different groups indicated that significant decrease of growth in test groups with control group and also 1 and 2 groups with 3 group (p0.05). To comparison FCR, SR, MR has shown a significant difference between different groups to each other (p<0.05). These results shows that 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 (p<0.05)