Why can't salt water fish live in fresh water fish tanks?
Why can't salt water fish live in fresh water fish tanks?
user
Because they're physiologically adapted to salt water, so they'd have a hard time handling the higher salt concentration in the aquarium water.
assistant
Is there less air in salt water or more?
user
That depends on what the fish is doing in the tank.  The oxygen concentration will be higher when the fish are swimming around.  The water will be more saturated with oxygen, because the fish will be moving around and mixing the water.  A similar thing happens with water in our lungs when we breathe.  But the fish need to return to the bottom of the tank to breathe the water, and so this mixing doesn’t occur all the time.  Therefore they'll absorb some less oxygen when they're at the bottom
assistant
Oh. So saltwater fish needs to swim more?
user