Here is a very interesting post from Tufts Lab.
In response to requests from anglers, we are posting a video showing how to “fizz” a bass. This is primarily directed at tournament anglers who will be keeping fish in a livewell for a few hours. If fish are to be released immediately, they would not normally require fizzing.
One of the research objectives in our lab has been to find a less invasive way to resolve this problem in bass caught from deep water. For now, however, we feel that “fizzing” is the most effective solution that tournament anglers can use to keep these fish in good condition.