Fish species is significantly lower in reservoirs than in rivers '
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Water in reservoir in fixed and so less mixing of oxygen more pollution, high concentration of bacteria because break in the natural flow of river.
Local fishes and species can't live in artificial conditions rather in regions where water level has disturbances. No vegetation below and by the reservoir system and less food.
High sediment loaded areas.
Rivers natural flow maintains the all cycle and purity of water leads to more fish in river in compare to reservoir
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