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The idea that fish do not experience pain is also ludicrous... They possess a central nervous system and can very much feel pain.
I'm also opposed to catch & release fishing for fun/sport for this reason.
Imagine a hyper-advanced species suddenly and painfully yanked you up into different atmospheric conditions where you're desperately unable to breathe.
Is it perfectly acceptable just because they put you back down in your natural environment before you died, with a new painful wound and traumatic experience?
I certainly don't think so...
Their bodies are also formed to exist supported by the water. When taken out their very bodies are crushing their organs. It's grim.
This depends on how deep the fish lives. For example, where I live, anglers are required to have a descending device on them and ready to go to quickly return a deeper sea fish to the depths without causing it significant harm.
At the same time, all hooks are required to be barbless so as to cause minimal damage to whatever is caught.
It definitely doesn't. Animal from the deep sea are used to being under higher pressure, that's an entirely different issue and not what I'm talking about.
Fish of any level will be supported in the water in a way that they won't in air so they haven't developed the structure of land animals to keep their organs from crushing each other.
Then there's a whole host of other issues that occur - https://www.researchgate.net/figure/Physiological-responses-occurring-when-fish-are-removed-from-water-Effects-of-air_fig1_281930182#:~:text=exposure%20can%20be%20considered%20acute,(Ferguson%20and%20Tufts%201992).
Even when only removed from the water for a short time a proportion of the fish die after being put back. When the time is increased to do measurements, take photos, whatever else you want to do, the proportion that die shortly after increases quite quickly.