Bass With Mouth Leeches

[Revenant]

Today I had a great day of fishing out on Lake Okeechobee. We boated about 20 fish and each of us landed one in the 5 to 6 pound area. What I was really surprised about though was that every single Bass we pulled from the lake had leeches infesting the roof of their mouths. They were about a centimeter in length, and had caused circular lesions in the roof the Bass' mouth.

I found an old article that is somewhat similar.

http://www.jwildlifedis.org/content/26/1/132.full.pdf

I've never encountered this in the Everglades. Anyone else seen anything like it?