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Gil Levesque

So what are these parasites on a walleye

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Caught this walleye today on lake erie. Part of a nice limit of six! It had these things on all its fins! Looked to me like maybe lamprey larvae! Any guesses?

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They look like leeches to me, but I have never seen them on a fish.

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Surprised to see them on a open water Erie fish, I would have thought you would more likely encounter them on say a resident Grand River fish or some other soft bottom. weedy, warm body of water.

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7 hours ago, dave524 said:

Surprised to see them on a open water Erie fish, I would have thought you would more likely encounter them on say a resident Grand River fish or some other soft bottom. weedy, warm body of water.

My observations show that it's actually the opposite in southwestern Ontario. I catch walleye with leeches on them at the end of the season in March. I have never caught a walleye with a leech on it in the summer. I've found leeches on my waders after trout fishing in April. Never happened in the summer on the same river. There's a certain trout stream I won't fish without waders. The strain of leeches there find you fast.  Leeches like cold water. I'm pretty sure they seek it out, along with blood!

I think the OP's fish came from deep water way below the thermocline. Probably very close to bottom.  And probably not very far from a depth change and some significant weed growth.

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