How do you preserve fresh water fish?
Both kinds of fish can live in a delta area. The line between salt water fish and fresh water fish seems to be getting blurrier. Sharks and other typically salt water fish are found many miles up stream in rivers that empty into the ocean. It appears that salt water fish adapt better than fresh water fish as the fish found in fresh water are not found out at sea.
Saltwater fish require salt water, and fresh water fish need fresh water, you can't mix them, or the fish will die. You need to look at each individual fishes needs as to what temp they need their water to be. There are some saltwater fish that can survive in fresh water, but it is not healthy for them.
Lets See If This Answers Your Question... Fresh Water Fish have A Liver That Can Process All Kinds of Stuff From Fresh Water. Wether It Be Dirty Water, Clean Water, or Sometimes Even Slightily Toxic Water... But The Transition To Fresh To Salt Lies In The Very Word Itself, SALT WATER... The Liver of A Normal Fresh Water Fish Can Only Handle Bits of Amount of Salt, But The Water In The Ocean Is So…