Dora Lake is a lake class 39 lake located 4 miles west of Wirt, MN in northwest Itasca County. Dora is a riverine system with inlets from the Bowstring and Popple Rivers and an outlet to the Big Fork River. Dora Lake is shallow with a maximum depth of 18 ft and a littoral area of 94%. Wild rice and other aquatic vegetation is abundant. The lake has been known to periodically winterkill.
The walleye gill-net catch rate increased from 0.6/net in 1998 to 1.9/net in 2006. The 2006 catch rate was within the lake class normal range and similar to the long-term average for Dora Lake. Sampled walleye ranged in length from 7.7 to 22.0 inches and growth was similar to the statewide average. Ages 1, 3-5, 8, 9 and 12 were represented in the sample. Good natural reproduction of walleye has historically occurred in the lakes and rivers connected to Dora Lake. Gill-net catch rates in Dora Lake should be interpreted cautiously since there is likely considerable fish movement in and out of Dora Lake on a seasonal basis.
The northern pike gill-net catch rate was 5.2/net in 2006. This catch rate was well above the 1998 catch of 1.3/net, but near the historical average for Dora Lake. Gill-net sampled pike ranged in length from 10.1 to 25.0 inches, with an average length of 17.7 inches. Growth was similar to the statewide average.
The gill-net catch rate for yellow perch was 52.2/net in the 2006 assessment. This catch rate was above the lake class normal range, but fairly typical for Dora Lake. Gill-net sampled perch ranged in length from 5.2 to 10.9 inches with an average length of 7.5 inches. Approximately half of the perch examined were infested with the parasites yellow grub and/or Neascus (black spot).
The trap-net catch rate for bluegill was below the lake class normal range at 2.1/net. Sampled bluegill ranged in length from 6.0 to 10.2 inches with an average length of 7.9 inches.
Similar to previous assessments, the gill-net catch rate for black bullhead was in the normal range for this lake class at 12.1/net. Other species sampled included bowfin, brown bullhead, golden and shorthead redhorse, pumpkinseed and hybrid sunfish, rock bass and white sucker.