Please Help ID this Lamprey

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Dima
Please Help ID this Lamprey
Caught a fish with this lamprey on it. Does anyone know what species of lamprey is this? Edit: Caught in Wisconsin River, Northern Wisconsin.
Dima
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TonyS
TonyS's picture
Silver Lamprey

If you found it in the midwest region, it would be a Silver

Unicuspid teeth narrows it to Silver and Northern Brook

The mouth disk looks to be larger in diameter than the body, which would eliminate Northern Brook. It's way too big for a Northern Brook Lamprey anyway. Also Northern Brooks are non-parasitic, so if assuming the likely case that you found it attached to a fish it would have to be one of the three parasitic species anyway

Of course if it was from some other region, this information might well be irrelevant

Dima
Thank you. Forgot to mention

Thank you. Forgot to mention the location - it was caught in Wisconsin River, Northern Wisconsin.

Corey
Corey's picture
Silver Lamprey

I agree with Tony, I think it's a native silver lamprey.