Rusty crayfish, an aquatic nuisance and an invasive species, has been discovered in a Larimer County river south of Estes Park, according to Colorado Parks and Wildlife. This is the first time the ...

This invader is eating through Colorado’s rivers, and it could wipe out native fish and plants if left unchecked.

For decades, the Signal Crayfish has been an ecological troublemaker. It is invasive and widespread across Europe, Asia and ...

Wildlife officials say that rusty crayfish are larger, more aggressive freshwater crayfish than other crayfish species native to the state. Robert Walters, invasive species program manager at CPW ...

Rusty crayfish, an invasive species, has been discovered in the Little Thompson River in Larimer County, Colorado. This aggressive crayfish, known for its big appetite and rapid reproduction ...

They could become aggressive and only the strongest survived. “They are a very super invasive species." The crayfish with a rusty-red coloring on their backs can grow to about 4 or more inches long.

“Rusty crayfish are much more aggressive than our native crayfish species and are not an ideal food source for our sportfish,” said Robert Walters, CPW’s invasive species program manager.

Two new crayfish species have been discovered and named, but face immediate threats from invasive species and human impact.

specifically from invasive crayfish species such as the rusty crayfish and virile crayfish—aggressive invaders that displace native populations and damage aquatic ecosystems. One of the biggest ...

“They are a very super invasive species." The crayfish with a rusty-red coloring on their backs can grow to about 4 or more inches long. Need a break? Play the USA TODAY Daily Crossword Puzzl ...