Nighttime. High whitefish are most active at night, often to the near shore or grass for food, so night fishing for guppies is also the best time to go out, high whitefish, scientific name: Coregonuspeled (Gmelin, 1789), for the Salmonidae, the whitefish genus of a kind of salmon, is a kind of high oxygen consumption of cold water fish, the body length of a slightly laterally compressed, the head is small, pointed muzzle, the mouth end position, upper and lower jaws of equal length or the lower jaw is slightly protruding.