The numbers of fish killing sea lamprey are going up in Lake Superior and down in Lake Michigan. The Great Lakes Fishery Commission says about 100-thousand adult sea lamprey are now in Lake Superior — more than twice the targeted numbers, although the agency is not sure why. Commission spokesman Mark Gaden tells the Duluth News Tribune the new totals are still a fraction of Superior’s all time high of 800-thousand lamprey in the 1950s, when treatments began to reduce the numbers. The lamprey arrived in the Great Lakes about a century ago after swimming in from the Atlantic Ocean. Their latest populations are down in Lakes Huron and Ontario as well as Lake Michigan, but they’re up in Lake Erie.