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Lampreys have rows of small, sharp teeth on their tongues and sucker-like mouths which they use to attach themselves to the fish. They then rasp away the flesh of the fish using their teeth and feed on the blood and bodily fluids.
You can put sucker fish in ponds, but you will need somewhere to keep it in the winter if you live in a state that has cold winters and/or snow. Unlike the Koi and goldfish they cannot live under the ice in the pond. The coldest temperature sucker fish can withstand is about 55 degrees.
Sucker fish are typically preyed upon by larger fish, birds, and mammals such as otters. They are also sometimes consumed by humans.
Sucker fish typically eat algae, detritus, small invertebrates, and sometimes fish eggs. They use their specialized mouths to attach to surfaces and scrape off the algae and microorganisms.
No because they stick to the wall of their tank and clean the walls of the tank.