Clamshell Lake is a 189 acre lake, and is part of the Whitefish Chain located in northern Crow Wing County. There is an Army Corps of Engineers boat access on the north shore of the lake. Access is also possible through a channel from Bertha Lake. Development is heavy with 103 homes and two resorts on 6.5 miles of shoreline. The maximum depth is 44 feet, with 75% of the lake 15 feet or less. Water clarity is good with a secchi depth of 16 ft.
Northern pike are abundant with a gillnet catch of 13.3/ net. They tend to run on the small side with an average length of 19 inches and weight of 1.6 lbs. Some larger northern pike were captured with 14% over 24 inches. The largest was 34 inches. Walleyes are not stocked directly into Clamshell, but are stocked annually as fry and every other year as fingerlings into the Whitefish Chain. Only 4 walleyes were caught in this survey, all of them over 20 inches in length.
Largemouth bass in the Whitefish Chain, including Clamshell, were sampled by a spring electrofishing survey. Largemouth bass were quite numerous with a catch rate of 112.5/hr. More information can be found in the Whitefish Lake survey.
Bluegill catches were above average, but the average size was only 5.9 inches. Growth was good with 19% over 7 inches. Black crappie over 8 inches account for 55% of the catch, but they are not very numerous. Yellow perch, an important prey species for walleye and northern, were caught in about average numbers. Size was too small to be targeted by anglers.
Other fish species present included bowfin, brown bullhead, hybrid sunfish, lake whitefish, pumpkinseed sunfish, rock bass, tullibee (cisco), white sucker, yellow bullhead, and greater redhorse. Species sampled during IBI backpack electrofishing, and seining included Iowa darter, Johnny darter, banded killifish, blackchin shiner, blacknose dace, bluntnose minnow, central mudminnow, golden shiner, and green sunfish.
- Zebra Mussel
Recreational activities such as recreational boating, angling, waterfowl hunting, and diving may spread aquatic invasive species. Some aquatic invasive species can attach to boats, while others can become tangled on propellers, anchor lines, or boat trailers. Many species can survive in bilge water, ballast tanks, and motors or may hide in dirt or sand that clings to nets, buckets, anchors, and waders. Fortunately, completing simple steps can prevent the transport of aquatic invasive species.