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Bythotrephes longimanus

LHPrism Status 
Tier 1 - Threat
Habitat 
Lake or Pond
Brackish Water
Key Characteristics 
Color
Clear, gelatinous with tiny black spots
Size
Extremely small and difficult to see individually. Can measure 1/4 to 5/8 of an inch.
Legs
Small spikes line the tail and legs.
Other
Form dense clusters that can feel like cotton or gelatin
Impacts of this species 

Spiny waterflea consumes zooplankton, a vital food source for native fish and crustaceans. It can also cluster on fishing lines and clog pole eyelets. 

LHPRISM Notes 

Spiny waterflea was introduced to the Great Lakes region in the ballast water of cargo ships. It has not yet been reported in the Lower Hudson PRISM.

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