I wrote:

> > > Regardless, unless they eat the bladder of a bladdered fish, and gulp
> > > down that gas, I'd have thought that gas was not a problem amongst the
> > > fishies. Anybody ever seen gas escape the tail end of a fish, any
> > > fish?

Strike wrote:

> > Yes!  :-)

and Mike Wallace wrote:

> Ditto, although not a fish, but Manatee's!

Yep, but them's mammals, and they don't eat fish, bladdered or not. :)

However, I am fairly astonished that I cannot remember (apart from
that occasion I described when the shark probably did) seeing a fish
fart. At the time I thought that the ejection of the gas was some kind
of compensation for the speed of the ascent, just as we divers have to
do it. Not so obviously.

Cheers,

Christian