Bjorn wrote:
(big snips)

> Firstly, nobody is "sinking" the bodies. Sharks don't have a swim bladder.
> If they don't swim, they sink. Without fins, they can't swim. So they sink.
> Plenty of pictures out thereon the Web of that.

You're right, although there are some, wobbegongs and Port Jacksons as
two examples, nurse sharks even (the merkin kind) who seem to be able
to languish on the bottom without moving/finning.

However this reminded me of just one incident that made me go to the
old Log Books (I always keep a Log Book if on a diving trip).

It was on 05/07/1990 (for the merkins 07/05/1990)
The late, lamented Coralita liveaboard.
Bougainville Reef, Australian Coral Sea and the viz was to the end of
the world.

My comment was "white tips including one making for the bottom at
flank speed" and I distinctly remember that this fish was also blowing
bubbles. Understand that this was on a near vertical wall ending way
down there somewhere.

Unfortunately I also remember that I thought I saw that fish
*ascending* and blowing those bubbles rather than *descending* but I'm
going from memory here. As well, that sighting could have been from a
previous trip (that particular Log Book is sadly lost).

Regardless, it happened, a distinct burst of bubbles escaped this shark.

Any answers?

Cheers,

Christian
--
The danger from computers is not that they will eventually get as smart
as humans, but that we will meanwhile agree to meet them halfway. Unattributed.