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Are there any aquarium fish that can adapt to either fresh or salt waters ?

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Not that I am aware of. I have had fish for about 20 years now and I've not heard of any. You could try contacting your local aquarium store (not petsmart or petco). They may know if there are any. These are not aquarium fish, but salmon are born in fresh water and move to salt water (the oceans) until they are ready to spawn, then they return to the same fresh waters they were born in. They spawn then die.
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apparently a Molly is capable of existing in both types of water. They are fresh water fish who will visit brackish water but return to the fresh water to live
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http://en.m.wikipedia.org/wiki/Poecilia_sphenops

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Or they get caught by eagles and get eaten on their way to spawn.
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i seriously doubt it

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I've had loaches do well jumping from a freshwater tank to a brackish tank.

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