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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 Strong That The Liver of A Fresh Water Fish Just Over Loads and Shuts Down Killing The Fish... Thats Why Salt Water Fish Have Evolved Their Livers To With Stand Lethal Amounts of Salt In The Water... The Same With Salt Water Fish, They Can Not Process Fresh Water Because their Livers Are Only Made To Process Salt Not Fresh... Some Fish Actually Can Do Both Like The BULL SHARK, Salman, (not a fish) Salt Water Crocidile...

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16y ago

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