Fisheries Lake Survey

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Name: Ann

Nearest Town: Orrock
Primary County: Sherburne
Survey Date: 06/27/2011
Inventory Number: 71006900

Public Access Information

Ownership Type Description
Township Concrete A public access is owned and maintained by Orrock Township and is located on the northwest side of the lake off of 254th Ave NW.


Lake Characteristics

Lake Area (acres): 182.85
Littoral Area (acres): 138
Maximum Depth (ft): 26
Water Clarity (ft): 12

Dominant Bottom Substrate: Sand (Abundant)
Abundance of Aquatic Plants: 46 Varieties Sampled
Maximum Depth of Plant Growth (ft): 13.9 (0-17)


Did you know? Each year, the MinnAqua program teaches youth and families across Minnesota about aquatic biology, fishing, and conservation..

Fish Sampled for the 2011 Survey Year

Species

Gear Used

Number of fish per net

Average Fish Weight (lbs)

Normal Range (lbs)

Caught

Normal Range

Bluegill Trap net 130.78 9.5 - 57.3 0.13 0.1 - 0.2
Gill net 18.50 N/A 0.12 N/A
Hybrid Sunfish Trap net 0.44 N/A 0.34 N/A
Largemouth Bass Gill net 0.17 0.4 - 1.6 3.64 0.5 - 1.3
Northern Pike Trap net 0.22 N/A 2.14 N/A
Gill net 13.67 3.5 - 8.9 2.40 1.6 - 3.0
Pumpkinseed Trap net 1.22 1.5 - 6.8 0.21 0.1 - 0.3
Gill net 1.00 N/A 0.07 N/A
Yellow Bullhead Trap net 4.11 2.7 - 13.5 0.64 0.4 - 0.6
Gill net 34.00 2.1 - 15.8 0.47 0.3 - 0.5
Yellow Perch Trap net 0.11 0.3 - 1.2 0.07 0.1 - 0.2
Gill net 0.67 1.0 - 10.3 0.12 0.1 - 0.2
Normal Ranges represent typical catches for lakes with similar physical and chemical characteristics.


Length of Selected Species (Trapnet, Gillnet) Sampled for the 2011 Survey Year

Species Number of fish caught in each category (inches)
0-5 6-8 9-11 12-14 15-19 20-24 25-29 30+ Total
bluegill 998 286 0 0 0 0 0 0 1288
hybrid sunfish 0 4 0 0 0 0 0 0 4
largemouth bass 0 0 0 0 1 0 0 0 1
northern pike 0 0 1 3 15 51 14 0 84
pumpkinseed 9 8 0 0 0 0 0 0 17
yellow bullhead 0 50 176 15 0 0 0 0 241
yellow perch 1 4 0 0 0 0 0 0 5


For the record, the largest Lake Sturgeon taken in Minnesota weighed 94 lbs., 4 oz. and was caught:

    Where: Kettle River, Pine County
    When: 9/5/94
    Statistics: 70" length, 26.5" girth

Fish Consumption Guidelines

No fish consumption guidelines are available for this lake. For more information, see the "Fish Consumption Advice" pages at the Minnesota Department of Health.


Status of the Fishery (as of 06/27/2011)

Ann Lake is located in Sherburne County, five miles west of Zimmerman. The lake has a surface area of 184 acres and a maximum depth of 26 feet. The watershed is small and dominated by forest and the lake is lightly developed. The lake has excellent water quality and a diverse aquatic plant community. Northern pike, largemouth bass, and bluegill are present. A public access is located on the northwest corner of the lake. A state forest campground and beach are located on the west side of the lake. Ann Lake was surveyed in June 2011.

Northern pike abundance was lower than the last survey in 2001, but still high and above the expected range for lakes similar to Ann. The average size was 21.5 inches and 2.5 pounds. The largest northern pike caught was 29.5 inches long. Northern pike growth was similar to other lakes statewide. Northern pike grew to 20 inches in five years. The percentage of northern pike longer than 24 inches was 22%.

Largemouth bass were sampled by daytime electrofishing in May 2011. The catch rate was low, but most bass were larger than 15 inches. The average size was 16 inches and the largest bass caught was 18.5 inches. Electrofishing was not possible in the shallow, heavily vegetated, south basin, likely reducing the number caught.

The number of bluegill was lower than in 2001, but still very high and well above the expected range for lakes similar to Ann. The average length was 5.5 inches and the largest bluegill was 8 inches. Bluegill grew slowly, reaching 6 inches in 7 years.

Few yellow perch were caught in 2011 and no black crappie. Past survey catches have also been low for both species. Other species captured during the survey included: hybrid sunfish, pumpkinseed, and yellow bullhead.


For more information on this lake, contact:

Area Fisheries Supervisor
7372 State Hwy 25 SW
Montrose, MN 55363
Phone: (763) 675-3301
Internet: Montrose Fisheries
E-Mail: Montrose.Fisheries@state.mn.us

Lake maps can be obtained from:

Minnesota Bookstore
660 Olive Street
St. Paul, MN 55155
(651) 297-3000 or (800) 657-3757
To order, use C0795 for the map-id.


For general DNR Information, contact:

DNR Information Center
500 Lafayette Road
St. Paul, MN 55155-4040
TDD: (651) 296-6157 or (888) MINNDNR
Internet: www.dnr.state.mn.us
E-Mail: info.dnr@state.mn.us

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