Tony
Jeffrey Fullerton wrote:
>
> Dave
>
> Snakeheads- the cold hardy species- would survive underwater the same as
> any other obligate air breathers such as frogs and turtles which
> hibernate at the bottom of frozen ponds and marshes. Turtles use a
> cloacal gill- literally breathe thru their bung holes while amphibians
> breathe thru their skins. With their metabolic demands reduced by lower
> temperatures and the higher oxygen content of cold water they get along
> quite well that way until Spring.
>
> Since Snakehead fishes still have gills, they ought to function in
> similar fashion when the temperature is very low. I wonder if their
> obligation to breathe air is really an obligation or just an option for
> dealing with circumstances where the temperature is high and oxygen
> content of the water is low?
>
> Jeff
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