Crayfish Monitoring

Vermont is suffering from an invasion of the rusty crayfish. Orconectes rusticus can be identified by their robust claws with black bands on the tips, and dark, rusty spots on each side of their carapace (body). They can out-compete native species, forcing native crayfish from daytime hiding areas and destroying aquatic plant beds. They have likely been spread into numerous waterbodies in Vermont by anglers using them for bait.

Monitoring crayfish

In 2005 the White River Partnership and Vermont Institute of Natural Science conducted a survey of rusty crayfish in the White River watershed. 85% of the crayfish collected were rusty crayfish or rusty-resident hybrids. The vast majority of the rusties and rusty hybrids were found in the mainstem of the river, indicating that a serious invasion was occurring there.

In 2010 state aquatic biologists partnered with watershed education consultant Jenna Guarino to offer a workshop to watershed teachers who wanted to help track the spread of rusty crayfish. Six teachers participated in the workshop and implemented at least one day of trapping with their students. A new crayfish species Cambarus robustus, was discovered during the workshop! Quality-assured data collected by schools was shared with state biologist Jim Kellogg, who built a Vermont crayfish species database and distribution map.

Since 2010 the WRP has worked with watershed teachers and students to monitor crayfish throughout the watershed. The WRP quality-assures data collected by teachers and students using the data sheet below, and shares the data with the state for inclusion in the Vermont crayfish species database and distribution map.

WRP crayfish field sheet 2015

Preventing the spread of crayfish

In 2010 the WRP received funding from Vermont’s Aquatic Nuisance Species Grant-In-Aid Program (GIA) to create a rusty crayfish informational poster, titled Crayfish of the White River, which was distributed to workshop participants and main stem towns.

In 2011 the WRP received GIA funds to work with partners and volunteers to develop a rusty crayfish identification guide based on the 2010 poster. The guide was first printed in June 2011, and was revised in 2012. The 2012 guide is available in electronic format below:

Field Guide to the Crayfish of the White River Watershed

For more information

Interested in learning more about crayfish in the White River? Please contact us!