During the Dog Days of summer, when rising water temperatures make trout sluggish and hard to catch, many fly fishermen hang up their rods. But for a growing number of anglers, hot, sunny days are the perfect excuse to target other species. Longnose gar are just one of several fish in Lake Champlain that thrive in warm water. And for at least one angler, fly fishing for these ancient predators is the perfect way to spend a summer day.