Credit: Jaclyn Hill |
Zebra mussels (Dreissena polymorpha) are one of the most catastrophic aquatic invasive species in North America. Native to Russia and Ukraine, these fingernail-size mollusks have spread around the world, often carried in ballast water—used to stabilize boats—as larvae, where they’ve caused billions of dollars of damage to fisheries, water treatment facilities, and other aquatic industries by clogging intake pipes and robbing nutrients from ecosystems. Now, researchers have discovered a new way they invade—by hitchhiking on fish. |
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The scientists made the observation while assessing fish communities in a lake in southeastern Quebec last year. They found a zebra mussel attached to a lake chub (Couesius plumbeus), a species of minnow typically about 12 centimeters long. The observation, reported this month in Biological Invasions, is the only time a nonlarval freshwater bivalve has been seen attached to a fish. The mollusk had latched onto the hapless minnow (pictured above) using protein fibers called byssal threads, which they also use to attach to plants, rocks, and concrete. |
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