Wisconsin’s Department of Natural Resources (DNR) defines invasive species as a “nonindigenous species whose introduction causes economic or environmental harm or harm to human health (WI Statute Section 23.22 (1) (c)).” These nonindigenous species can dramatically spread in new habitats because they left their predators and competitors behind in their native ecosystems. Invasive species can significantly alter ecosystem functions and economic value, ecological relationships, recreation and human health.

*These are some known invasive larval fish species in Lake Michigan that were caught in the 2017 USFWS AIS EDM Program: Round goby (Neogobius melanostomus), White perch (Morone americana), Alewife (Alosa pseudoharengus), and Common carp (Cyprinus carpio).*

**Click on either the picture or common/scientific names to access larval fish species information in the Lake Michigan Drainage on species that was not caught in the 2017 USFWS AIS EDM Program. These species include Silver carp (Hypophthalmichthys molitrix), Bighead Carp (Hypophthalmichthys nobilis), Goldfish (Carassius auratus), Rainbow Smelt (Osmerus mordax), and Ruffe (Gymnocephalus cernua).**

Clupeidae

Larval Alewife. 25 mm. United States Fish & Wildlife Service. Green Bay, Lake Michigan, WI. Adam Dziewa. 2018.

*Alosa pseudoharengus (Alewife)*

Cyprinidae
Larval Common Carp. United States Fish & Wildlife Service. Marian Shaffer. 2018.
*Cyprinus carpio (Common Carp)*
Larval Silver Carp (Hypophthalmichthys molitrix). 8.68mm. Adults captured on Missouri River; spawned and raised in lab 2012. EPRI.
**Hypophthalmichthys molitrix (Silver Carp)**
Larval Bighead Carp (Hypophthalmichthys nobilis). 10.03mm. Adults captured on Missouri River; spawned and raised in lab. Stacey Ireland, USGS Great Lakes Science Center 2013. EPRI.
**Hypophthalmichthys nobilis (Bighead Carp)**
Larval Goldfish (Carassius auratus). Auer 1982.
**Carassius auratus (Goldfish)**

Gobiidae
Larval Round Goby. 7 mm. United States Fish & Wildlife Service. Green Bay, Lake Michigan, WI. Adam Dziewa. 2018.
*Neogobius melanostomus (Round Goby)*
Moronidae
Larval White Perch. 18 mm. United States Fish & Wildlife Service. Green Bay, Lake Michigan, WI. Brianna McDowell. 2017.
*Morone americana (White Perch)*

Osmeridae

Larval Rainbow Smelt (Osmerus mordax). Dr. Auer 1982.

**Osmerus mordax (Rainbow Smelt)**

Percidae

Adult Eurasian Ruffe (Gymnocephalus cernua). USFWS 2017.

**Gymnocephalus cernua (Eurasian Ruffe)** No Larval Pictures of Eurasian Ruffe Available. Click on Picture/Names to Access Information about Larval Eurasian Ruffe.

**Not caught in 2017 USFWS AIS EDM Program**