Not long. In some species a few minutes in others maybe an hour or so and in others maybe a few days. It would be a terribly painfull way for the fish to die and extremely cruel of anyone to do such a thing to a fish.
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That depends entirely upon its genetic code and the environment it is in.
a fish (any breed)
Yes, Hermit crabs can survive in salt water but they dont live as long in water as they do on land
Salt water fish should not be kept in fresh water. I dont how long they will survive but you shouldnt keep them in fresh water at all. If you have an emergency and you need to put them in fresh water, try to keep them in there for as short of a time as possible
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It can probably live for 20 years as long as it is in a healthy tank
They are from tidal eastuarys in the tropics and so are capable of handling both sea and fresh water. They should be OK for a couple of years or so provided there is at least some salt in the water.
Yes. Red Tailed Sharks are fresh water.
There are fish from several genera called Frog fish (Angler fish). They require specific marine living conditions in order to survive. In a fresh water aquarium they would be dead almost immediately.
otto cats are your best pick as long as your other fish are not aggresive
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