Somewhat off-the-subject of Techdiver, Richard Pyle replied:
#Fish don't get bent in nature; at least not in the ocean. The dissolved 
#gas in the fish's blood and tissues is essentially at equillibrium with 
#the water.  The dissolved gas in the water is at MOST 1 ATA, regardless of 
#the depth.

Ah, but surely the gas in thier swim bladders (assuming they have them) or 
anywhere else (gut?) is at ambient pressure (that at depth). On ascent 
could this gas not be forced back into the fishes blood either as emboli or 
simply into solution giving a situation where intravascular bubbles could 
be seen on ascent.

Now what is the partial composition of gas in the swim bladders of fish 
from that depth anyway and how does it get there? 

Is it N2, or are they on trimix?     :)

just curious,

Bob

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