Weird that this gets posted today.
Me and my husband were snorkelling yesterday and we saw a longear who the back half of his body was way darker than the front half, kind of a dark greyish brown, with no pattern, and we were wondering what would cause that.
On the way back to shore I saw a bluegill with one side of his face way darker grey than the rest of his body.
Interested to see if anyone knows what causes this.