Difference Between Amphibians and Fish

[mpmistr]

I have no doubt that ACF have some salinity tolerance of saltwater, but my question is that how can they tolerate up 40% of salinity when our ocean is about 3.5% in salinity...?

So perhaps you're saying that ACF can live in brackish water that is up to 40% of the 3.5% saltwater? Even then I suspect they can't withstand that salinity for majority of their lifetime. It's probably more of a temporary tolerance.

Yes, 40% of the 3.5% saltwater; brackish conditions. I know they've invaded brackish conditions in the wild, not sure if they can survive in it permanently though, They are quite salt tolerant -- for a frog.

[UncleChester]

Yes, 40% of the 3.5% saltwater; brackish conditions. I know they've invaded brackish conditions in the wild, not sure if they can survive in it permanently though, They are quite salt tolerant -- for a frog.

I think the Crab-eating frog, Rana cancrivora, is the winner for salt water tolerance. It can supposedly handle 80% of sea-waters salinity for days if it is acclimatized to it. Its tadpoles can manage water saltier than the sea. Here's the study (full pdf is even available): Osmotic Regulation in the Crab-Eating Frog (Rana Cancrivora)

[mpmistr]

Yup that is pretty impressive indeed. I'd say that would be the winner.