Wildlife officials are sounding the alarm after an invasive and potentially damaging crab species was found in the U.S. for the second time this year.

According to the Oregon Department of Fish & Wildlife , the Chinese mitten crab, was found in the Willamette River near the Sellwood Bridge on Nov. 17. The discovery follows a crab being found in a different location in April.

The crab was caught by hand and removed from the river. ODFW called the discoveries “concerning” in a news release earlier this month.

Chinese mitten crabs are known to burrow into dikes, levees or stream banks which can increase erosion and damage flood control and water supply systems.

Additionally, the medium-sized crabs, about 3-inches wide, prey on native species, consume fish eggs and compete for food, pote

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