High temps and Gill loss

First off, I'm not putting this in the sickness forum because I don't think the Axolotls are sick, just morphing out.

Is there any evidence that consistently high temperatures (76-78F) can cause an axolotl to undergo metamorphosis?

Now before you start berating me on bad husbandry practices, the situation is sometime I came into and working to remedy it. I have a total of 5 axolotls in 4 separate tanks. About 2 weeks ago they all started loosing their gills. At first I thought it could be the feeder fish, but when the axolotls with no fish in the tanks started loosing gills I knew it had to be something else. There are several other options that I'm having tested for but I'm also looking into if temperature is an issue. Behavior wise, there hasn't been much change. All of the axolotls are still eating as before.

With 5 axolotls showing the same symptoms, I really doubt it's spontaneous metamorphosis. It's probably stress from the heat causing gill loss.

Or else he has larval tigers, not axolotls.

Where did you get them, SalSa? Are you sure they are axies?