Luring an Invasive Fish With Pheromones

A scientist has discovered a chemical compound that attracts
an invasive fish. The Great Lakes Radio Consortium’s Mike Simonson
reports that this could be a breakthrough in controlling harmful fish
populations:

Transcript

A scientist has discovered a chemical compound that attracts an invasive fish. The
Great Lakes
Radio Consortium’s Mike Simonson reports that this could be a break through in
controlling
harmful fish populations:


Eurasian ruffe were introduced in the Duluth-Superior harbor from ballast water of
ocean-going
ships in the 1990’s. Ruffe reproduced so quickly, they now make up 80 to
90-percent of the fish
population, squeezing out native fish. Now, they’re spreading eastward across Lake
Superior
toward the lower Great Lakes.


University of Minnesota Fisheries Professor Peter Sorenson says he’s isolated a
pheromone that
will cause the fish to cluster in great numbers of male ruffe who are tricked into
thinking it’s time
to mate.


“It causes a great deal of sexual arousal and excitement. So to help detect this
thing, I suppose
like a dog they get a little crazy and just start swimming around like crazy and
nudging and
inspecting the fish in the tank.”


Once they’re clustered, Sorenson says it may be possible to find a way to cut their
population.
Sorenson hopes to find a similar pheromone in carp and sea lamprey, other invasive
species
which threaten native fish in the Great Lakes.


For the Great Lakes Radio Consortium, I’m Mike Simonson.

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