HAYWARD, Wis. — Chilly nights on northern Wisconsin’s Chippewa Flowage don’t deter 15-year-old spearfisher Gabe Bisonette. “It worries me, what I’ve seen in my lifetime, what’s my grandson going to see in his lifetime?” Gabe Bisonette, a member of the Lac Courte Oreilles Band of Lake Superior Ojibwe, spears a walleye by headlamp on the Chippewa Flowage Monday, April 15, …