In defense of those who believe soda stops bleeding in fish, it is a statement often shared by widely read publications. Just last year W2Fish published an article about using soda to stop bleeding and the conclusion was that while getting the fish back in the water was best practice, soda did appear to stop bleeding and did not impede recovery. While they called this a study, I would call it a SMALL experiment and it wouldn’t come close to surviving any type of peer review. That was not the only article published by W2Fish about the positives of soda in the last year. I also heard an angler on a fishing show this year share the practice.
The only real study I am aware of was the one published in 2020 that looked at pike: https://www.biorxiv.org/content/10.1101/2020.06.15.150797v1
Their finding was there was no effect. They also reinforced the need to scientifically test angler anecdotes.
My profession is medicine, specifically biotechnology. It is not uncommon to find alternate applications using existing elements/compounds, many of which have led to new breakthroughs. However, it is important to study the impact and effect before wider application. As others have said, there is little evidence, other than anecdotal, to support the soda claim and most biologists would suggest potential harm. While to my knowledge the harm claim is also likely theory that has also never been validated, I would err on the side of the folks who make their living studying and observing over some YouTuber or blogger who’s only proof is a 30 second observation before releasing the fish.
IMO, the best thing we can do is share findings. If the goal is to educate others to take better care of our resources, belittling is the best way to keep misconceptions hidden and limit learning. It is understandable that these impressions still exist as they are still often repeated. This will go away once there is definitive proof but unfortunately it is difficult for science to keep up with all of the wives’ tales that spread across the fishing world.