Brad,
Thanks for the information on how to treat walleyes that you are going to release.
I do the following:
Measure the fish for length before they are placed the livewell for the first time. Pump all the water through the livewell I can. I use a 750 gpm pump, 500 gpm are standard.
I measure the girth in the livewell with a sewing tape. Sewing tapes are very flexible. I recommend the use of sewing tapes for girth.
I weigh the fish in the net after it has fully recovered in the livewell. I don’t like to see a fish weighed by clamping onto its jaw, can’t be good for the fish. Then Iput the fish back in the livewell.
Then we set the stage for the picture. Gloves on so you don’t drop the fish, coaching on how to hold the fish, get an idea of the angle for the picture and background wanted. I try to always support the fish in two places and never hold them by the jaw.
I get the fish out and take a few pictures and back in the livewell. Allow the fish to recover in the livewell.
Check the pictures and if all is well, when the fish has recovered, I get the fish in the water and pump the fish holding the tail until the fish swims toward the bottom on it own. I have had great success releasing fish. Treat them well and they will swim away.
Even after all of that care we are never absolutely sure that they will live. But I feel like I have done everything I can to ensure a successful release to provide another fisherman an opportunity to have the thrill of catching a big fish.
I am open to any suggestions. 99% + swim away. I have had 2 fish over the years that I could not revive. The warmer the water the more recovery time is needed.
dan or