Fizzing is the only method I know, I just am not convinced that they survive having a needle shoved into their cavity to release air. I have fizzed them when I have caught out deep, mostly bass. I have caught them, that there bladder was hanging out of their mouths which is really their stomachs, by the time I got them back to the surface. The law is the law. To short release it. I dont have this issue very often with fish since most of my fishing is done in 15 foot or less of water.