Freshwater and Saltwater Fish

[paradigm2200]

Was reading the kaplan blue book and it kinda of confused me.. Anyone know the ways that freshwater and saltwater fish osmoregulate...

is it that saltwater fish actively excrete salt across gills and freshwater fish absorb salt thru gills or is it the other way around....because kaplan makes a reference both ways...

thanks

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[howui3]

Saltwater fish - live is a very salty water and tend to gain salt and lose water, because in hypertonic solution. To compensate they will lose salt and gain water through their gills.

Freshwater - in hypotonic solution and will gain water and lose salt. so they make up by taking up salt and getting rid of extra water.

 

[paradigm2200]

Saltwater fish - live is a very salty water and tend to gain salt and lose water, because in hypertonic solution. To compensate they will lose salt and gain water through their gills.

Freshwater - in hypotonic solution and will gain water and lose salt. so they make up by taking up salt and getting rid of extra water.

yeah...thats what i thought....but kaplan seemed to confuse me...thanks...