Thread: Depth trauma and survival rates.

I believe the trout and salmon caught up in the canals shouldnt be allowed to be released..... the catch n drop on shingle yank out hook after its flapped around and then lobbed back in over shoulder isnt working..the number of dead fish floating is shocking at times...if Dad takes 3 kids up there and has to take home and clean what they catch...well they wont be standing there for hours stuffing dozens of fish anymore..it will be one or two each then "right we off home now". if trout has any bleeding it comes home.

Originally Posted by Micky Duck

I believe the trout and salmon caught up in the canals shouldnt be allowed to be released..... the catch n drop on shingle yank out hook after its flapped around and then lobbed back in over shoulder isnt working..the number of dead fish floating is shocking at times...if Dad takes 3 kids up there and has to take home and clean what they catch...well they wont be standing there for hours stuffing dozens of fish anymore..it will be one or two each then "right we off home now". if trout has any bleeding it comes home.

This. 100%, I believe in catch and keep (but only what you can utilise then go home). Catch and Release is only a way to fish for longer.

Since we are talking about this, today we fished deep for us 30m +, fish were blowing 10 ft below the surface ( a large gut full of bubbles being expelled) gurnard , snapper and the odd small blue cod ...spikies and grey boys and Chinamen were all fine with no sign of this.

The snapper were hissing when lifted into the boat, as VC pointed out if that's their gut what is happening internally to the blood streams ie a diver getting the bends?

Not the bends, just bowel gas expanding in the lower surface pressure. I doubt the snapper die from the bends. After all if they are immediately released and swim back down to depth they are in nature's hyperbaric chamber. It's got to be the pure stress of the fight for their lives that kills them.

Interesting historical anecdote (sorry, can't help myself)...

The Messerschmitt 163 Komet was unpressurised and when it rapidly reached its top altitude of 12,000 metres (within 2-3 mins) the pilot's bowel gas would be painfully expanded (ambient pressure at that height is 1/5 of at sea level!). Probably a lot of hissing happening on the descent towards allied bomber formations. To counter this new problem pilots on stand-by were fed a diet less likely to produce bowel gas. No pea soup or baked beans. Again, no bends if the pilot survived, as back at depth pressure on the surface.

Originally Posted by Cordite

Not the bends, just bowel gas expanding in the lower surface pressure. I doubt the snapper die from the bends. After all if they are immediately released and swim back down to depth they are in nature's hyperbaric chamber. It's got to be the pure stress of the fight for their lives that kills them.

Interesting historical anecdote (sorry, can't help myself)...

The Messerschmitt 163 Komet was unpressurised and when it rapidly reached its top altitude of 12,000 metres (within 2-3 mins) the pilot's bowel gas would be painfully expanded (ambient pressure at that height is 1/5 of at sea level!). Probably a lot of hissing happening on the descent towards allied bomber formations. To counter this new problem pilots on stand-by were fed a diet less likely to produce bowel gas. No pea soup or baked beans. Again, no bends if the pilot survived, as back at depth pressure on the surface.

The science shows snapper are increasingly less likely to survive the deeper they are caught from.....less than 10m not a problem other than gut hooking or gill handleling but for evey 5 m deeper than that the survival rate is less and less.
Thats the facts.

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First up, the bends, also known as decompression sickness (DCS) is caused by micro-bubbles forming in the tissues on decompression of gases as a diver ascends to the surface. The effects can sometimes be reversed by recompression therapy, but not always. Hence, in bad cases of DCS, a diver may end up in a wheel chair or worse. What we see in snapper is similar, but different. It is an expansion of gas in the swim bladder. This crushes the internal organs and often causes the stomach to pop out the mouth. Unfortunately, release (and recompression) doesn't reverse this injury. If you had a high pressure hose inserted in to your abdominal cavity and were blown up to the point that your organs were crushed, letting the air out wouldn't make it instantly better, you would most likely die.