Invasive bloody red shrimp found in Lake Superior

An invasive species, with a name right out of a horror movie, hasbeen found for the first time in Lake Superior.

The bloody red shrimp, which is usually found in the Caspian region of eastern Europe,was found around Twin Ports harbour in Minnesota last July.

If the population grows, the crittercould potentially represent a threat to native species that share its diet ofzooplanktonand algae.

"How it got here? We're not really sure," said Doug Jensen, an aquatic expert with the University of Minnesota Sea Grant Program, who noted that although only one specimen has been found in Lake Superior, the bloody red shrimp can already be found in other Great Lakes.

There are several ways it could have arrived in Lake Superior, he said. The first is that it could have swam through from other Great Lakes, the second one is that it could have come from a ballast water discharge, and the third one is from a bait bucket introduction.

"The finding really raises more questions than ... answers," Jensen added.

Early detection important, but the species is elusive

The critter does have natural predators,such as laketrout, in Lake Superior. Otherwise, Jensen said, bloody red shrimpare very difficult to manage.

"I'm not sure there's any real effective management tool," he said when asked about how authorities could get rid of a bloody red shrimp invasion. Early detection would be one way to manage the issue, he said. Jensen advises boaters to make sure they change filters and clean their boats going from lake to lake in order to avoid contaminating the different bodies of water.

But he said spotting bloody red shrimp can be difficult.

The species is photosensitive, so it hides at the bottom of the water during the day and avoids lit environments at night.

One way to know ifthe species has established itselfin Lake Superior is to lookfor orange swarms in the water at night. If such orange swarms are seen, Jensen said people shouldreport the sighting to the authorities.