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Originally Posted by munki  could you introduce all livebearing fw fish in to saltwater aquariums? if not then how is the mollie able to do it? |
slowly. they are just very tolerant of salinity levels. naturaly they live in hard waters where rivers meet the ocean and the saltwater mixes with the fresh water, this water is called brackish water. mollies specificly hangout in mangrove swamps like off the coast of florida. anyway, its not much of a jump for them to go to saltwater. its just as stressful for them if not more stressful to adapt to a normal FW tank. fish that live in these waters, like mollies, are able to tolerate salinity changes in there water. there are other fish like archers and gobies that hail from these waters as well. mollies are just more popular because they are cheap, make great feeders and are tank breed.
maybe a better know fish that goes back and forth from fresh to salt waters are salmon. trout, striped bass even scorpionfish among others make a yearly migration from salt to fresh waters during spawning. so they are born in fresh water but as adults live in saltwater only to return later to fresh water. here is link for ya
http://www.christiananswers.net/q-aig/aig-c037.html