Red swamp crayfish outcompete other native species for food and habitat — and can cause structural damage to dams and levees.
It is not a fair battle: Two scientists on a tiny boat against one of the world's most invasive species.
"Hot dogs are really attractive to these crayfish," Keller told Scripps News."So that means that now we purchase and use vast numbers of hot dogs."During a recent river outing, Keller and his student Sydney Ware extracted 26 crayfish from the traps and anesthetized them with clove oil — a humane method to kill the creatures.
"What we're discovering here is equally applicable in the Chicago River as it is in other places all around the world where people are trying to catch these crayfish," Keller said.The creatures used to be kept as science pets in elementary schools and were sometimes sent home with students. That's how Keller believes they were introduced to the Chicago River.
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