Building dams is a threat to fish because it takes away from their habitat and breeding grounds. Dams may also hinder their ability to migrate.
because the dams drive away the fish and makes the ecosystem FUNKY
yes they can, aslong as the temperature is rigth and they have a decent amount of food fish should be able to survive in a dam. theyu water may have to be PH treated though
Well, fish need rivers, and so do the plants that live around it. Humans may also need it if it has dams in it that provide hydroelectric energy.
Dams have been build blocking fish like salmon from climbing upstream to reproduce. The Dams are built to generate electricity with their generators and the make towns inhabitable though.
Dams can and have prevented the fish from getting to their normal breeding grounds which they have used for thousands of years.
Beavers build dams to live in
HELL YES! According to Save Our Wild Salmon, a coalition of environmental groups and commercial and sport fishing associations, dams alone are responsible for the loss of 92 percent of salmon headed out to sea and of up to 25 percent on their way back upstream. "Fish are gone entirely from almost 40 percent of their historic rivers," says Dietrich, who adds that most of the remaining fish are at risk, too, qualifying for full protection under the Endangered Species Act. Quite simply, the fish just cannot swim past the dams.
Delta smelt are not being eaten. The dams California's making are sucking the fish into the grinding part of the dams and are grinding them into pieces.
To restore fish populations
Yabbies live in creeks, dams, rivers, irrigation channels in Australia.
Short answer- both. Dams can interfere with the migration of fish, and cuase rivers to silt up. However, dams are also used to control flooding, supply water and power.