Fishhook Waterflea
Fishhook waterfleas reproduce rapidly and eggs are capable of lying dormant all winter, resisting drying and freezing. As a result of their sharp spines, smaller fish cannot readily consume them, adding to their explosive populations.
Common Name: Fishhook waterflea
Scientific Name: Cercopagis pengoi
Native Range: Europe, Asia
Background
Fishhook waterfleas (Cercopagis pengoi) are tiny crustaceans less than 1/2″ long with long, sharp, barbed tails. The fishhook waterflea has a slender spine and prominent S-shaped loop on the tail. Fishhook waterfleas collect in gelatinous globs on fishing equipment and lines.
Habitat
Fishhook waterfleas thrive in deep lakes but can also be found in shallow lakes and rivers.
NYS Distribution Map
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Identification
These invasive crustaceans have a long, S-shaped spine. Clumps of fishhook waterflea form on fishing line hooks and feel like gelatin or cotton batting with tiny black spots.
Impact
Fishhook waterfleas are voracious predators of small zooplankton, like Daphnia, an important food for young native fishes. They reproduce rapidly and eggs are capable of lying dormant all winter, resisting drying and freezing. As a result of their sharp spines, smaller fish cannot readily consume them, adding to their explosive populations.
Prevention and Control
No control methods exist. Prevention is key. Since fishing and boating equipment is the most likely means of spread, anglers and water-users must take precautions. Boats and all fishing gear should be thoroughly checked, cleaned, and dried before entering new waterways.
Additional Information
- Invasive Species Best Management Practices
- Fishhook Waterflea Fact Sheet (Finger Lakes PRISM)
