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The difference is Saltwater Fish tend to live in environments where there is salt available in the water (oceans) and freshwater fish live in environments that lack in salt(rivers, ponds, streams).
There are also a number of biological and physiological differences relating to water and salt retention and excretion.
What else can I help you with?
What is the difference between saltwater and freshwater in fish tanks?
The same as in the ocean
Why are some fish saltwater fish and others freshwater fish?
Because saltwater fish can only breathe in saltwater (as in the ocean) and freshwater fish can only breathe in freshwater (as in tap water.)
Do freshwater fish need some kind of salt?
Freshwater fish derive small amounts of salt from their freshwater habitat. If you place a freshwater fish in saltwater, the difference in habitat will cause the fish to burst.
Are drum fish saltwater or freshwater fish?
There are freshwater drum, and saltwater drum species.
Is the guppy fish a saltwater or a freshwater fish?
saltwater
Are the platy fish saltwater or freshwater?
They are freshwater fish.
What is the difference of freshwater and saltwater fishing pole?
saltwater poles tend to be larger because there are larger fish in oceans.
How much freshwater can a saltwater fish take?
A saltwater fish tank can be half freshwater and all of the saltwater fish will live but not for very long.
Are lionfish freshwater or saltwater fish?
saltwater
What freshwater fish survive in saltwater tank?
Certain freshwater fish can survive saltwater conditions; examples are black mollies, mono's and scats. All of these fish aren't truly freshwater or saltwater, they are Brackish. Brackish is between freshwater and saltwater, and so these fish are highly adaptable.
Are minows saltwater or freshwater?
They are freshwater fish.
Are spotted eagle rays freshwater fish or saltwater fish?
They are Saltwater fish.
