Glowfish?

Misery nodded towards the fireflies, “Below them in the water, do you see the fish?” If she hadn’t noticed it before he assumed she would as he directed her to look for it.  The fish had been more obvious before the fireflies came to surround it.  “Is there a species of winter fish that glows,” the boy's brow furrowing as it didn’t make a lot of sense to him.  If an animal was food for another then glowing seemed one of the worst survival traits you could end up with.  

“For that matter, it doesn’t seem normal for fireflies in winter or for them to follow a fish.”  Misery paused as he mused, “unless they are following it because they are attracted to its glow?”  Could that be it?  Was the fish using a natural glow to lure in fireflies as its food source?  If so it was doing a lousy job at hunting the way they were able to fly above the water without fear.

An overly bright moon, fireflies in the wrong season, and now a glowing fish.  Winter, it seemed, was a season of strange tidings each year.  The fish seemed to be in no hurry to leave, for the most part simply stayed in place.  If not for the cold Misery would be tempted to go into the lake for a closer look.  

"Misery"