No, they are tropical fish but can live in cold water aquariums if you keep the water around 74 degrees. The Plecostomus will die in water below 60' but don't push them, They are meant for tropical aquariums.
Plecostomus can survive in cold aquarium water as long as room temp does not go to low. Their life span will shorten, and aggression and stress will cause problems. If one must have a pleco in a cold water aquarium one must consider a Bristle nose pleco which only grow to 4 1/2", opposed to the common pleco which grows to 24". If kept with gold fish make sure one is feeding the pleco very well or it might just suck the slim off the goldfish causing them to die.
The coldest water recommended for them is 72 degrees Fahrenheit but they prefer higher, up to 82'F.
No they do not live in ponds because it gets too cold for them usually. They are native to Tropical South America.
They can if it is the right temperature and doesn't get too cold.
It isn't really recommended because it is a tropical fish but can live with koi if it doesn't get too cold.
A Plecostomus can live by itself.
No Plecostomus can not live outside in Michigan. It gets too cold. They prefer the water between 72'-82'Farhenheight(106'-116' Celsius). The only place in the United states that they could live outside year round is parts of Arizona, California, New Mexico and other hot south western states that never drop below about 65'.They can only live outside in certain places of those states not the whole state.
MOSTLY live in cold water
Koi are a cold water fish as are Sturgeon. Plecostomus are a tropical fish so they should not be kept together in the first place. Plecostomus are a large but peacefull algae eating fish and they are no real threat to any other fish.
clams live mostly in cold water.
Cold water.
I am guessing that you mean a Plecostomus. The answer is NO. Each of the species needs totally different conditions. Goldfish are cold water fish and suffer when the temperature goes over 75F. Plecostomus are tropical fish and suffer when the temperature goes below 75F. They will both survive for a while in one anothers parameters but eventually they will die from living in the wrong conditions.
Danios normally live in warmer water but are also excellent swimmers in cold water
plecostomus what do you feed it
Clown fish are tropical marine species, they do not live in cold water.