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I posted in another thread about not releasing snapper caught from deeper waters 10-15m plus due to the diminishing returns of survival of the fish as the water they were pulled from gets deeper and was asked for some evidence.
This is not the study I had read but another by our western neighbors which while not exactly the same shows similar trends in survival vs depth of capture.
https://www.fishing.net.nz/default/a...ma%20study.pdf
I will see if I can find the other study too.
Not only snapper but Blue Cod, they are very vulnerable to handling and I personally believe we are killing more fish with the increase in the size limit from 30 -33cm , the amount of 31-32 cm fish being handled and returned has increased significantly over the last 3 years by my own standards, and as a diver I have seen first hand numerous cod returned "fit and well " dead or dieing on the seabed.
I personally believe we should take a feed and move on...catch and release fishing is a falsehood / feel good fairy tale. We expose fish to high levels of stress , fatuge and depth change as well as handling oxygen starvation etc..better to bin the first few and leave the rest than damage a number of fish ...
Only my personal view ..very much each to there own enjoyment!
I only add this ...will check my dive info..but the recommended assnent for a diver is 30 ft per minete That's 10 meters per minete.
Totally agree. I used to do a lot of catch and release. I now think that was the wrong thing to do based on various experiences and reading around the subject. It’s not easy to admit you’re wrong and change what you do, but sadly, I think I just created a lot of shark food.Quote:
Originally Posted by stingray
Trout releasing is the same, especially jigging, light gear helps with bringing them up slowly, but many die on releasing
I would also add that the limit is a limit, not a target. A lot of people seem to miss that. Go fishing, take what you need, stop when you have it. My little family only needs 2 or 3 decent pannies to keep us going until the next trip.
@Gibo I have not come across any data on kingfish survival rates.
Certainly some species of fish are capable of handling big and rapid depth changes in their day to day life while others are not.
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Won a trip on Taupo once. A few of us went. Good skipper on the charter boat . I think I counted 8 dead undersize trout floating round the boat when we leftQuote:
Originally Posted by Maca49
Didnt even get a feed. Said fuck this its crap... Never been back. They were just wasted not my cup of tea.
My feeling is that kingfish are OK if handled carefully. This isn't based on anything scientific, but they are tough fish. When I'm diving, I see them rocket from 30 metres to the surface chasing bait fish with no worries. I have never seen a kingfish not release nicely, but I take good care of the fish. No gaffs, no flapping about in a deck, no deep hooking etc.Quote:
Originally Posted by veitnamcam
Have done little fishing but I did enjoy it. I avoid watching TV fishing programmes where they throw a fish back after putting it through a desperate fight for its life.
Mute point, you are not a fishQuote:
Originally Posted by stingray
MootQuote:
Originally Posted by Gibo
No, that’s inappropriate in the current climate
agreed ...I should have used the other tables expansion of air from depth to surface ..ie the first 10-20 ft your air half etc etc reverse that and the greater the depth the more expantion ..the more internal damage ...Quote:
Originally Posted by Gibo
A nice change from venison....Attachment 97222:thumbsup:
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.Quote:
Originally Posted by Micky Duck
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.
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.Quote:
Originally Posted by Cordite
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.
