Originally Posted by
Nic
Right, to try to set this issue straight I have called InfoFish and spoken to Bill Sawynok.
He says the DPI has performed studies on this. One set of large fish was held vertically and another set was held horizontally (these were barra, I believe). Then both groups of fish were released into holding tanks.
The mortality of the vertically-held fish was 100%. X-rays showed that some had vertebrae that had come apart, and all had suffered significant internal damage. The fish didn't die within hours or days, as I had expected; it actually took them several weeks to die. Looks like it takes some time for their damaged organs to gradually shut down.
Tough though cod may seem to be, I can see no reason why they wouldn't suffer the same organ ruptures as the barra did. Fish have never had the need to evolve organs that can withstand the full brunt of their own body weight, unbouyed by water.
Fortunately, even when you have caught a very large and heavy fish it's still possible to get a photo of it lying horizontally. I once caught a monstrous gold-spot and still managed it (albeit with shaking arms!) It can help if you sit down and bear some of the fish's weight on your lap.
Alternatively you can hold the fish in the water and get your mate to take a photo from further up the boat. You see plenty of magazine photos of happy anglers holding large Murray cod, barra etc. in the water in that way. I reckon those pics look great, I am trying to take more of them myself.
Nautical Prince I still commend you for trying to do the right thing, it's an admirable attitude to have.