<P> The rusty crayfish ( Orconectes rusticus ) is a large , aggressive species of freshwater crayfish which is native to the United States . Its range is rapidly expanding in North America , displacing native crayfishes in the process : it is known to have reached New England , Ontario , Illinois , Wisconsin , Michigan , Minnesota , Iowa , Missouri , Colorado , New Jersey , New York , Pennsylvania , Maryland , and even Manitoba . It was first spotted in the mid 1960s . The rusty crayfish was first captured in Illinois in 1973 , and has been collected at over 20 locations in the northern portion of the state . In 2005 , O. rusticus was found for the first time west of the Continental Divide , in the John Day River , Oregon , which runs into the Columbia River . </P>
<P> The rusty crayfish ( Orconectes rusticus ) is a large , aggressive species of freshwater crayfish which is native to the United States . Its range is rapidly expanding in North America , displacing native crayfishes in the process : it is known to have reached New England , Ontario , Illinois , Wisconsin , Michigan , Minnesota , Iowa , Missouri , Colorado , New Jersey , New York , Pennsylvania , Maryland , and even Manitoba . It was first spotted in the mid 1960s . The rusty crayfish was first captured in Illinois in 1973 , and has been collected at over 20 locations in the northern portion of the state . In 2005 , O. rusticus was found for the first time west of the Continental Divide , in the John Day River , Oregon , which runs into the Columbia River . </P>
where did the rusty crayfish originally come from
where did the rusty crayfish originally come from
United States
United States