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I wouldn't punch a hole in a fish to release anytime of year, jmho.. eat it or feed it and stop fishing deep water if you feel like catch and releasing.. many deep water fish swim swallow during winter months. Another way to avoid bloating a game fish's bladder is to reel it up slow giving the fish a chance to release the pressure as it is played up slowly. hope this helped answer your question
(c) Any fish caught that is not to be counted in the creel limit shall beimmediately released to the water with as little injury to the fish as possible. Any fishplaced on a stringer, in a container, in a live well, or not released immediately to the water, shall be considered to be reduced to possession of the angler and shall be killedprior to being transported from the water of origin. No fish that has been reduced topossession of the angler shall be released alive without prior written approval from theDepartment.
taken from http://wgfd.wyo.gov/web2011/Departments/Hunting/pdfs/Regulations_Ch46_July2011.pdfBy reading that. Sticking a needle in them, to me is harming the fish.
EDIT: Of course if you keep short fish and mention it here, or post a pic, you run the chance of public humiliation tactics and lambasting!
I think a lot of us would just like to know if we're doing right or wrong when were trying to release fish, you know so others can enjoy it to, that was a total DB statement, imo