Invasive spiny water flea the focus of Quetico-based study

A tiny invasive species called the spiny water flea will be the focus of a three year study in Ontario'sQuetico Provincial Park.

Michael Rennie, an associate professor in biology, canadaresearch chair in freshwater ecology and fisheries, and research fellow at the Experimental Lakes Area, will belooking specifically at the impact on fisheries, and theresults will be used to formmanagement plans for Quetico Park.

Rennie has secured a $75,000 grant from the Quetico Foundation to study the impact of the spiny water flea on two of Quetico's keyfish species.

He saidthe spiny water flea first entered the Great Lakes via ship ballast.

"They originally came from Europe," he said. "So like the zebra mussel they came over from the Baltic region through the ballast of ships. So we saw them initially in the Great Lakes in the early early 1980s and then they quickly moved to inland lakes from there."

Rennie said the organism has spread through Minnesota, into many partsofOntario and they are starting to spread through the prairie provinces.

He said the spiny water flea has made significant inroads innorthwestern Ontario watersheds and is now spreading throughQuetico park.

Rennie said the spiny water flea competes with the tiny organisms small fish feed on.

"Juvenile walleye and yellow perch respond pretty strongly to the presence of the spiny water flea. Soin terms of reducing their growth ratesthat can have big concerns."

Rennie said the research in Quetico will be primarily focused on two species:walleye and lake herring. He saidthey will be using information from previous fish monitoring studies in the park to compare the average sizes of young fish before and after the arrival of the water fleas.

"We have good information thanks to the sampling that's in place with the broadscale monitoring program through the Ministry of Natural Resources and Forestry," Rennie said. "As well as the monitoring that Parks [Canada] has been doing for several years now. We have a fairly good handle on where where these things are. So every time a monitoring crew goes out ... part of the program is to take some zooplankton samples with the idea that we can use it to track the spread of invasive species."

Renniesaid that there is a lot at stake, as recreational fisheries are a keystone of local economies.

He noted that fisheries are worth $1.3 billion per year in Ontario alone. Rennie said a component of the study will include monitoring any potential impacts of climate change.

"We've got information going back to the 1980s," he said." We have a really good opportunity to look for changes that are unrelated to spiny water. So for instance if we go to a lake where we've seen growth changes in the fish and spiny water flea has invaded you know very well climate change is happening too. We have to look at other lakes where they haven't invaded and see if we've seen similar changes as well."