How do dams affect fish?
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Dams can have a variety of effects on fish. In some cases, they can reduce migration pathways, disrupt spawning and prevent fish from accessing their spawning grounds, which can decrease populations in certain areas.
Dams can also cause changes in water temperature, which can affect the growth rate of fish or lead to reduced oxygen levels that could be harmful for certain species. In some cases, the fragmentation of habitats caused by dams can lead to the extinction of some fish species, while in other cases the construction of fish passes or ladders can allow new fish populations to access upstream areas.