It’s spawning stress.
I wondered the same.. I caught it on medium set up fishing for smallmouths. We are open year round CPR if anyone is wondering…
Pretty fast catch and I was lucky. Broke the line in the net. It was mid 30 fish.. I am just holding her out in the photo. We didn’t measure it. Was still losing eggs in the boat so dumped her back in the water pretty quick.
I remember seeing one on uncut angling that looked red. They were hitch hiking for someone to fish with them. A truck had pulled over with a 50 inch pike that was dead. Guessing in a net and looked red if I remember right.. I could be wrong but it looked odd. This one was weird but looked super healthy. It had red in the jaw plate, eye socket and in a scaled pattern on the sides. Was easly 80-90% spawned out.. The belly scales were wringling like you see on a big walleye right off spawn.
I only had two guesses.. Spawn stress or too much time under Methanies pipe draining in the river here… haha. Between the needles, barbie dolls and turd spinner we have options. Big dark rabbit hole to look into there.