Arrowhead Lake

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Auto Lake or Auto Club Lake is known locally as Arrowhead Lake and will be referred to as such in the remainder of this discussion. Arrowhead Lake is in Ecological Lake Class 10, which consists of 76 lakes in northeast Minnesota that are small and have clear and very soft (unmineralized) water. Arrowhead Lake is typical of lakes in this lake class except that it has a higher proportion of shallow area due to the shallow western bay. Arrowhead Lake ranks as mesotrophic according to Carlsons Trophic State Index. Arrowhead Lake was thermally stratified on 8/8/2006 with a surface temperature of 74 F and a bottom temperature of 54 F. Adequate oxygen for fish (more than 2 ppm) was retained to a depth of 19 feet, where the temperature was 70 F. There are no inlets or outlets on Arrowhead Lake. Aquatic plants grow to a depth of 10 feet and are sparse except for the shallow western bay. The most common aquatic plants are blue flag and water shield. Lake bottom substrates along the shoreline are mostly sand, with some muck, boulder, and rubble. Arrowhead Lake was stocked from 1934 through 1969 with walleye, largemouth bass, black crappie, bluegill sunfish, and muskie. Walleye fingerlings have been stocked biennially since 1979. Summary data from a 1939 investigation showed that largemouth bass, black crappie, yellow perch, and a few walleye were present in the lake. Three fisheries lake surveys (1953, 1978, 1998) and four fish population assessments (1982, 1985, 1990, 2006) have been conducted on Arrowhead Lake. All of these investigations used 4-6 gillnets and 6-8 trapnets. Fish populations in 2006 were dominated by bluegill sunfish, largemouth bass, walleye, and yellow perch. Other fish species were present in low numbers. Bluegill numbers in 2006 (34.1/trapnet) were somewhat higher than normal (in the third quartile) for this lake class and were higher than the median bluegill catch of 15.5/trapnet in all investigations on this lake. Bluegill sizes in 2006 averaged 6.5 inches (0.22 lb), which was somewhat larger than normal (in the third quartile) for this lake class and was similar to the average size of 6.7 inches in all investigations on this lake. The largest bluegill in 2006 was 8.0 inches. All of the bluegill were ages 3-5. Bluegill growth was variable, depending on the year-class, but generally was somewhat slower than normal (in the second quartile) by area standards. Largemouth bass numbers in 2006 (4.8/trapnet) were higher than normal (in the fourth quartile) for this lake class and were higher than the median largemouth catch of 1.7/trapnet in all investigations on this lake. The electrofishing catch of largemouth in 2006 of 22.3/hour on-time was higher than in the only previous electrofishing, in 1998, of 6.2/hour on-time. Largemouth sizes in 2006 averaged 6.6 inches (0.15 lb) in the trapnets, which was smaller than normal (in the first quartile) for this lake class and was smaller than the average size of 7.7 inches in all investigations on this lake. The largest largemouth in 2006 (16.6 inches) was caught while electrofishing. Most largemouth were age one. Largemouth growth was somewhat faster than normal (in the third or fourth quartile, depending on the age) by area standards. Walleye fingerling stocking began in 1979 and except for a few walleye observed in 1939, no walleye were captured in fisheries investigations until 1982. Walleye numbers in 2006 (9.8/gillnet) were higher than normal (in the fourth quartile) for this lake class, and were the highest found in any investigation on this lake. Walleye sizes in 2006 averaged 16.0 inches (1.5 lb), which was normal (at the median value) for this lake class and was similar to the average size of 16.6 inches in all investigations on this lake. The largest walleye captured in 2006 was 22.3 inches. Walleye fingerlings have been stocked biennially, in odd-numbered years, since 1983. In 2006, as many walleye were captured from non-stocked years as from fingerling-stocked years. Walleye growth was faster than normal (in the third or fourth quartile, depending on the age) by area standards. Perch catches in Arrowhead Lake have been quite variable over time, ranging from 70.1/gillnet in 1953 to 2.5/gillnet in 1978. Perch numbers in 2006 (6.8/gillnet) were somewhat higher than normal (in the third quartile) for this lake class, but were lower than the median perch catch of 10.7/gillnet in all investigations on this lake. Perch sizes in 2006 averaged 6.9 inches (0.14 lb), which was normal (at the median value) for this lake class and was similar to the average size of 7.2 inches in all investigations on this lake. The largest perch in 2006 was 9.1 inches. All of the perch were ages 2-5. Perch growth was normal (near the median) by area standards. Some of the game fish examined in 2006 were infected with neascus, and a few of the perch were also infected with yellow grub. Neascus (black spot) and yellow grub are common parasites that are native to the area. They cannot infect humans, are often removed by filleting fish, and are killed at temperatures used to cook fish.

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