Events

Crayfish in the Classroom: Learning Without Invading (recorded on 4/17/25, video will be posted soon)

Science teachers incorporate live crayfish into their classes to teach concepts related to scientific observation, ecology, anatomy, and more. However, several species of crayfish often used may be invasive to different regions. Purdue University master’s student Izzy Paulsen presents her mixed method study that draws from interview and survey data conducted in Great Lakes states to explore how and why teachers use live crayfish and their interest in outreach. Responses indicate that using crayfish is a relatively rare behavior, but there are high levels of motivation for doing so and for interest in receiving outreach. These findings can guide professionals in developing resources and programs that promote safe behaviors while maintaining the educational and engagement benefits from crayfish use.

Using Photography to Showcase Crayfish Color and Biodiversity (recorded on 1/15/25, 59 minutes)

With over 700 species and a near-global distribution, crayfishes are among the most dominant and widespread freshwater invertebrates. Across species, they vary in size, shape, ecology, behavior, and more. One especially interesting trait is their color: while many are drab, around 15% of species exhibit vibrant blues, purples, reds, and oranges. The function of these conspicuous colors remains unknown but may offer valuable insights into the evolution of coloration across animals. Dr. Zack Graham from West Liberty University describes his research on crayfish color while also discussing how his photography highlights their underappreciated biodiversity.

Working with Michigan Pet and Pond Retailers to Prevent Aquatic Invasive Species (recorded on 6/4/24, 62 minutes)

Through the Reduce Invasive Pet and Plant Escapes (RIPPLE) outreach program Michigan pet and pond retailers receive one-on-one store visits, invasive species identification tools, and outreach materials to share with their customers. Surveys conducted in 2017 and 2021 of retailers’ invasive species knowledge and behavior have been used to guide program improvements and the development of creative outreach pieces, such as the new “Great Lakes Almanac to Invasive Crayfish: Identification and Reporting”. Paige Filice from Michigan State University Extension highlights retailer engagement techniques, key takeaways from retailer surveys, and highlights a new crayfish outreach item applicable to anyone in the Great Lakes basin who provides invasive crayfish education.

Natives & Invaders: The Status of Canadian Crayfishes (recorded on 5/21/24, 60 minutes)

Crayfish biologist Dr. Premek Hamr outlines the biodiversity, status and management of both native and introduced freshwater crayfishes in Canada. The recent introductions and spread of several Procambarus species including the first record of the Marbled crayfish (Procambarus virginalis) in Canada/North America are also addressed.

The Threat of Invasive Crayfish on Crayfish of Greatest Conservation Need In Illinois: Habitat Associations and Conservation Implications (recorded on 3/14/24, 56 minutes)

Illinois has seven crayfish species on the IL Species of Greatest Conservation Need (SGCN) list, four of which are considered state-threatened or endangered. Currently, invasive crayfish species do not occur in the aquatic systems that support these SGCN species. Since 1995, invasive species ranges have been broadening in Illinois and spreading south toward these unique systems while displacing native species. Dusty Swedberg from the Illinois Natural History Survey discusses the habitat associations of these SGCN species and uses data collected in Illinois to show the adverse effects that introduced crayfish species can have on native crayfish—discussing a link to why invasive species are one of the most significant threats to SGCN crayfish species in Illinois.

What do you mean I need a permit? Lessons learned-Michigan pond chemical treatments for invasive red swamp crayfish (recorded on 1/24/24, 59 minutes)

Resource managers are increasing awareness of the significant impact of invasive crayfish on native crayfish and ecosystems; however, many agencies lack integrative pest management plans to control invasive crayfish populations. Chemical control is potentially an effective tool; however, resource managers may not be familiar with the regulations governing the use of pesticides. Annie Allert from the U.S. Geological Survey summarizes key regulations governing pond treatments for invasive crayfish, specifically the invasive red swamp crayfish (Procambarus clarkii), the collaborative approach for permitting used in Michigan, and examples of permitting documents, treatment equipment and staffing requirements.