The wild fish, Poecilia reticulata, is native to Venezuela, Barbados, Trinidad, northern Brazil and the Guyanas. It occurs inmany habitats from mountain streams to swamps and ditches, but are mostnumerous in very small streams and densely vegetated lakes and ponds.Introduced to numerous other areas in the world to eradicate mosquitoes butfrequently this has rendered negative impacts on native flora and fauna. Hobbyfish will almost certainly be commercially-raised.
That is not a true statement. I question the writer's credentials. The first part states they can be kept in saline conditions and then closes by saying they can't. Someone needs to review before publishing or quoting. Salt does NOT cause physiological issues for all fish. It is an issue for MOST freshwater fish with very few exceptions. Guppies, can thrive in marine environment as well as fresh. They are one of the few that can. They can be acclimated to marine conditions but you don't just toss in salt and expect them to be OK. Marine acclimation will take substantial time to achieve and most people have no desire to invest that much time or effort. For the record, Guppies are able to withstand salinity in excess of double the salinity of seawater. Which BTW, is not what the OP said anything about.
My apology for not being more specific and less general, and making it clear I was referring to freshwater fish throughout. Obviously marine fish was no where in my thought at the time.
Thank you for clarification on your intent, You did miss this part of my comment "For the record, Guppies are able to withstand salinity in excess of double the salinity of seawater." So yes, guppies will in-fact thrive in a marine environment. They are one of the few fishes that can and will. As a breeder of guppies, I too, was shocked to learn this. This has been further evidenced in some shark species. I don't recall which ones but might be the thresher or the cookie-cutter shark (sorry, I just no longer remember).
