Anglers will take to the icy surface of Lake Champlain this weekend to promote clean water. This is the third year of the perch ice fishing derby put on by Mill River Brewing and the Friends of Northern Lake Champlain. The money raised goes to support clean water efforts in the area to keep Lake Champlain from getting as many algae blooms. Friends of Northern Lake Champlain says these efforts have raised $9,000 over the past few years. The Third Annual Clean Water Ice Fishing Derby starts at 7 a.m. Saturday and runs until 3 p.m. It’s very family-friendly and there are hourly prizes. On-site registration is from 7-8 a.m. at 624 Shipyard Rd., Highgate Springs. Fishing is from 8 a.m.-3 p.m. Registration is $25/individual. Children under age 10 fish for free.