Where possible, it is recommended that anglers use some form of fish care product to treat their catch when on the bank e.g hookholds, body sores, wounds etc. I highly recommend using the following products as they are not only affordable but the best for the fish!
A natural product used for the treatment of hookholds. Affordable and lasts a long time! Can be bought from health food shops and some pharmacies.
NT Labs Ulcer Swab and Wound Seal:
A dedicated koi carp care product used by professionals all over the world. Not cheap but by far the best available for fish care. http://www.ntlabs.co.uk/products/Ulcer-Swab.html
See the video “Carp care” in the Video folder on how to use these products!