Coutta wrote: I've also learned a little bit about barotrauma and the smart money seems to say don't release fish caught from deep water. |
kitno wrote: I have one other example of barotrauma About six months ago during a concrete pour, the young fulla (numpty) was told to ask the driver to back up a bit. Numpty left the wheelbarrow right behind the truck in his blind spot. The obvious result was some serious barrowtrauma. |
Coutta wrote: But Fish Addict, most will swim away but how long did they last after that. |
Fish Addict wrote: How about your kingfish, we regularly see them being spiked back in, are they also casualties? Again, I don't believe you or I or the so-called scientific experts can conclusively say one way or the other. |
viscount wrote: I was watching a fishing show here in the states and they where catching what looked like hapuka but smaller they were up in Seattle area, when they caught a type of fish that had to be released they had a release mechanism that they clipped onto the fishes mouth and sent it down on a weighted rod, the guy was saying it’s 90% effective to for survival, they were in 100+m of water I was quite impressed with the whole deep release. |
Fish Addict wrote: ..some fish appear to be able to cope with barotrauma better than others... With the pressure change from 200+m to the surface, the increase in volume of any gas filled cavities is so great they have probably burst, rather than just inflated. The critical word in your comment above is 'appear' How about your kingfish, we regularly see them being spiked back in, are they also casualties? Although Kingfish have swim bladders, they have evolved a completely different feeding style that involves regular rapid changes in depth. Undoubtedly some are casualties, but probably not due to barotrauma. Possibly their swim bladders can be physically vented rather than the gas needing to be reabsorbed. Jack Macks used as livebaits are similarly unaffected by multiple trips involving hundreds of metres of depth change. Again, I don't believe you or I or the so-called scientific experts can conclusively say one way or the other. Correct, but if the scientific evidence mostly starts pointing in the same direction, you need a fairly compelling reason to ignore it. Just out of curiosity, why are you releasing 50-60cm snapper pulled up from 200m+ ? WA fishing rules ? |
JW wrote: I like the scientific study. In summary - No mortlaity if released from 21m or less. Great news. 2 in every 100 fish released from 30m die. Over 30m it increases dramatically to almost half. On that basis, anything coming up from 30m+ should be kept if legal. If it's 20-30m and the fish appears healthy, I think it can reasonably be expected to survive. |
waynorth wrote:
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