Help Protect
Maine Lakes


Crayfish Monitoring

Rusty Crayfish (Orconectes rusticus) - Photo courtesy of Jeff Gunderson

Rusty Crayfish (Orconectes rusticus) – Photo courtesy of Jeff Gunderson

Maine is now home to several non-native crayfish species. Of those species known to be from ‘away’, two are considered by state experts to pose the greatest threat to native ecosystems: rusty crayfish (Orconectes rusticus) and red swamp crayfish (Procambarus clarkii). Working in concert with a team of researchers, the LSM is looking for volunteers to help determine the statewide distribution of these and other crayfish species. The protocols for collecting, preserving and submitting crayfish specimens is provided below. Participants will receive a loaner crayfish trap and additional technical assistance. If you are interested in participating in this important program please sign up here!

Resources for Crayfish Monitors:

Crayfish Trap - Photo courtesy of VLMP

Crayfish Trap – Photo courtesy of LSM

NEW!! Reporting your findings has never been simpler!

Please help us capture your findings and incorporate them into Maine’s growing statewide database, by completing this simple online questionnaire.

Our Mission

The Mission of the Lake Stewards of Maine (LSM) is to help protect Maine lakes through widespread citizen participation in the gathering and dissemination of credible scientific information pertaining to lake health. LSM trains, certifies and provides technical support to hundreds of volunteers who monitor a wide range of indicators of water quality, assess watershed health and function, and screen lakes for invasive aquatic plants and animals. In addition to being the primary source of lake data in the State of Maine, LSM volunteers benefit their local lakes by playing key stewardship and leadership roles in their communities.


LSM is a non-profit 501(c)(3) organization committed to the collection of information pertaining to lake water quality. For 50 years, trained volunteers throughout Maine have donated their time so that we may all learn more about one of Maine’s most beautiful and important resources — our lakes.