Silver Lamprey
Ichthyomyzon unicuspis · Petromyzontidae
About this fish
- Spawning
- April, May and June
- Largest length
- up to 39 cm (15 inches)
- Lifespan
- up to 7 years
- Matures at
- about 6 years old
Values come from a national database of the United States, not Wisconsin surveys: maximum length is the species' largest recorded anywhere, and spawning months are range-wide (Wisconsin timing, in a colder climate, can be later).
USGS FishTraits 14.3 (CC0). Credit: Frimpong and Angermeier, U.S. Geological Survey.
21 open records of this fish in Wisconsin were used here.
Lakes where it has been recorded
From open fish survey and museum records. A record shows the fish was found near the lake in that year, not that it is there now.
Showing 8 of 8 lakes
- Fountain City BayWisconsin1,397 acresrecorded 2014 (1 record)recorded
- Lake Saint CroixPierce County4,668 acres · 60 ft deeprecorded 1950 to 2005 (2 records)recorded
- Perch LakeMonroe County33 acres · 10 ft deeprecorded 2004 (1 record)stocked, recorded
- Lake WisconsinColumbia County9,000 acres · 24 ft deeprecorded 1988 (1 record)Lowstocked, recorded
- Lake PepinPepin County25,494 acresrecorded 1986 (1 record)recorded
- Lake OnalaskaLacrosse County7,688 acres · 40 ft deeprecorded 1982 (1 record)Lowrecorded
- Lake MichiganWisconsin0.4 acresrecorded 1920 to 1935 (3 records)stocked, recorded
- Lake SuperiorWisconsinrecorded 1926 (1 record)stocked, recorded