Jeez guys, get over it. Treat all fish you catch with the proper respect they deserve. If you choose to kill a fish considered legal by regulation, do so quickly and humanely ... if a fish is to be released do it quickly and properly and with the least possible impact on it's survival, which in most cases means no gloves, no gravel rash, no gill exposure to anything but water... basically common sense.
If you think angled fish respond to pain perhaps it's time to consider your conscious and maybe, stop fishing ... many would thank you, mostly other anglers.