Researchers have discovered a new way Zebra mussels invade.
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 using protein fibers called byssal threads, which they also use to attach to plants, rocks, and concrete. The discovery is particularly concerning because fish are highly mobile organisms that don’t have a means of removing these parasites. And lake chub and similar species are often used as bait by anglers, which means they’re frequently carried from one body of water to another.
Though boaters and others who use infested waters for recreation are warned to wash their watercraft, remove any clinging plant matter from their equipment, and discard any water they might be carrying before traveling to another body of water, those who use baitfish are likely unaware that they may be inadvertently transporting zebra mussels, the authors fear. The discovery, they argue, suggests additional vigilance may be necessary to slow the spread of zebra mussels to new locations.
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