The Round Gobie is an aggressive and voracious bottom dweller from China that drives away small native fish in the Great Lakes. University of Michigan fishery biologist David Jude discovered the round gobies in the Great Lakes in 1990. Scientists have been trying to figure out exactly how they got there, and how they quickly spread to all five lakes ever since.
Oceangoing freighters were the prime suspects. But round gobies are bottom-dwelling fish, so how could significant numbers of them get inside ships? Now Scientists think they have the answer.
At night during the summer breeding season, newly hatched round gobies leave their lake-bottom homes and swim to the surface. This nocturnal migration greatly increases the chances that large numbers of hatching's will get sucked into the ballast tanks of freighters.
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment