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Invasive Round Gobie Fish Spreading Swiftly Through Great Lakes


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Geplaatst op 07 september 2007 - 22:00

Ever since fishery biologists discovered non-native round gobies in the Great Lakes in 1990, scientists have been trying to figure out exactly how the unwanted intruders got there, and how they quickly spread to all five lakes. Now new information on the behavior of the fish present a new possibility. At night during the summer breeding season, countless newly hatched round gobies leave their lake-bottom homes and swim to the surface. This nocturnal migration--never before documented among round gobies--boosts the chances that large numbers of hatchlings will get sucked into the ballast tanks of Great Lakes freighters.

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