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GLIN==> Exotic Waterflea Reports Needed


Great Lakes Waterflea Reports

Exotic invaders can mess up your life. The spiny waterflea (Bythotrephes
cederstroemi) and fishhook waterflea (Cercopagis pengoi) are two species
which have recently invaded the Great Lakes.  Both of these exotic
waterfleas are commonly caught on fishing lines and downrigger cables
where they look like gelatinous blobs. Fouling by these waterfleas can
cause serious difficulties for fishermen and other water users.  Clumps
can clog the first eyelet on fishing rods, preventing fish from being
reeled in.  Clogged eyelets and cottonlike clumps on the spool can strip
the drag on bait casting reels.

Help fight these invaders by participating in the Great Lakes Waterflea
Reports website at www.glerl.noaa.gov/seagrant/cercopagis. This is an
attempt to compile and provide timely information to Great Lakes
researchers and water users as to the location and extent of exotic
waterflea populations.  The website includes an interactive map noting
the locations of current high densities of waterfleas which link to
anecdotal reports of the extent of the problem (density and timing) for
that location.

Public participation is essential to the success of this tracking
effort.  Anglers and boaters on the Great Lakes are in a unique position
to be the first to notice changes in the abundance of these organisms.


Reports of densities at locations not yet on the interactive map and
‘all clear’ reports for those locations which are currently mapped are
the most essential.  All reports of increased or decreased local
densities of exotic waterflea populations help to strengthen
understanding of the causes of local waterflea ‘blooms.’  The website
includes brief instructions for the identification of both the spiny and
fishhook waterflea.  While useful, positive identification is not
necessary to make a report!  Reports should include date and location.
GPS coordinates are useful if available, as is information on the time
of day that the observation was made and the depth at which the
waterfleas were found.

Don’t have web access?  Reports can also be left at 734-741-2287.


Rochelle Sturtevant
Sea Grant Extension Agent
Great Lakes Environmental Research Lab
2205 Commonwealth Blvd.
Ann Arbor, MI 48105

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