Fisheries Lake Survey

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Name: Mule

Nearest Town: Longville
Primary County: Cass
Survey Date: 07/15/2013
Inventory Number: 11020000
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Public Access Information

Ownership Type Description
DNR Gravel old public access - north end
DNR Asphalt West side directly off State Hwy 84.


Fishing Regulations:

Special and/or Experimental Fishing Regulations exist on this lake. Please refer to our online Minnesota Fishing Regulations.

Lake Characteristics

Lake Area (acres): 524.58
Littoral Area (acres): 182
Maximum Depth (ft): 47
Water Clarity (ft): 14.8 (14-15.5)

Dominant Bottom Substrate: N/A
Abundance of Aquatic Plants: N/A
Maximum Depth of Plant Growth (ft): N/A


Did you know? Spawning habitat improvements can enhance naturally reproducing populations of fish species such as walleye and northern pike.

Fish Sampled for the 2013 Survey Year

Species

Gear Used

Number of fish per net

Average Fish Weight (lbs)

Normal Range (lbs)

Caught

Normal Range

Black Crappie Trap net 2.75 0.5 - 2.2 0.33 0.3 - 0.5
Gill net 2.22 0.3 - 1.7 0.22 0.2 - 0.5
Bluegill Trap net 38.38 7.7 - 43.4 0.21 0.1 - 0.2
Gill net 9.67 N/A 0.11 N/A
Brown Bullhead Gill net 0.44 0.3 - 1.8 1.42 0.5 - 1.1
Hybrid Sunfish Trap net 0.12 N/A 0.61 N/A
Largemouth Bass Trap net 0.50 0.4 - 1.5 1.34 0.2 - 0.7
Gill net 2.78 0.5 - 1.7 1.13 0.5 - 1.2
Northern Pike Trap net 1.38 N/A 0.99 N/A
Gill net 18.67 2.2 - 8.7 1.39 1.5 - 3.2
Pumpkinseed Trap net 5.50 1.4 - 5.9 0.05 0.1 - 0.2
Gill net 4.33 N/A 0.07 N/A
Rock Bass Trap net 1.50 0.8 - 3.7 0.28 0.2 - 0.4
Gill net 4.89 0.7 - 4.4 0.54 0.2 - 0.4
Smallmouth Bass Gill net 1.44 0.2 - 1.6 1.32 0.8 - 1.8
Tullibee (cisco) Gill net 0.78 1.3 - 10.4 3.74 0.3 - 1.0
Walleye Trap net 0.12 0.2 - 0.7 0.58 0.7 - 2.8
Gill net 4.44 1.0 - 5.0 1.41 1.2 - 3.0
White Sucker Gill net 0.67 0.5 - 2.0 3.10 1.6 - 2.6
Yellow Perch Gill net 2.00 1.5 - 13.8 0.21 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 2013 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
black crappie 18 17 6 1 0 0 0 0 42
bluegill 171 223 0 0 0 0 0 0 394
brown bullhead 0 0 0 4 0 0 0 0 4
hybrid sunfish 0 1 0 0 0 0 0 0 1
largemouth bass 0 10 3 11 5 0 0 0 29
northern pike 0 0 1 10 132 25 8 3 179
pumpkinseed 79 3 0 0 0 0 0 0 83
rock bass 7 24 25 0 0 0 0 0 56
smallmouth bass 0 5 1 2 5 0 0 0 13
tullibee (cisco) 0 0 0 0 3 4 0 0 7
walleye 0 1 13 10 10 7 0 0 41
white sucker 0 0 0 0 4 2 0 0 6
yellow perch 2 13 3 0 0 0 0 0 18


For the record, the largest Pumpkinseed taken in Minnesota weighed 1 lb., 5.6 oz. and was caught:

    Where: Leech Lake, Cass County
    When: 6/6/99
    Statistics: 10.1" length, 12 1/8" girth

Fish Stocking Activity

Fish Stocked by Species for the Last Ten Years

Year Species Size Number Pounds
2012 Walleye fingerlings 3,125 246.0
  Walleye yearlings 761 236.0
2010 Walleye yearlings 3,061 312.0
  Walleye fingerlings 941 124.0
  Walleye adults 138 46.0
2009 Walleye fingerlings 7,148 366.0
  Walleye fry 250,000 2.1
2007 Walleye yearlings 80 21.0
  Walleye fry 250,000 2.1
  Walleye fingerlings 9,549 343.0
2005 Walleye fingerlings 5,547 364.0

Stocking Notes
1 - indicates fish purchased and stocked by private citizens and sporting groups.
2 - indicates fish purchased by the DNR for stocking.

Stocking Fish Sizes
Fry - Newly hatched fish that are ready to be stocked usually called "swim-ups". Walleye fry are 1/3 of an inch or around 8 mm.
Fingerling - Fingerlings are one to six months old and can range from a size of one to twelve inches depending on the species. Walleye fingerlings range from three to eight inches each fall.
Yearling - Yearling fish are at least one year old. A one-year-old fish can range from three to twenty inches depending on the species. Walleye yearlings average from six to twelve inches.
Adult - Adult fish are fish that have reached maturity. Depending on the species, maturity can be reached at two years of age. Walleye reach maturity between the ages of four and six years.

Fish Consumption Guidelines

These fish consumption guidelines help people make choices about which fish to eat and how often. Following the guidelin es enables people to reduce their exposure to contaminants while still enjoying the many benefits from fish.

Pregnant Women, Women who may become pregnant and Children under age 15

LAKE NAME
County, DOWID
Species Meal Advice Contaminants
Unrestricted 1 meal/week 1 meal/month Do not eat
MULE
Cass Co., 11020000
Bluegill Sunfish All sizes        
Cisco All sizes        
Crappie All sizes        
Largemouth Bass   All sizes     Mercury
Northern Pike   All sizes     Mercury
Smallmouth Bass   All sizes     Mercury
Walleye   All sizes     Mercury

General Population

LAKE NAME
County, DOWID
Species Meal Advice Contaminants
Unrestricted 1 meal/week 1 meal/month Do not eat
MULE
Cass Co., 11020000
Bluegill Sunfish All sizes        
Cisco All sizes        
Crappie All sizes        
Largemouth Bass All sizes        
Northern Pike All sizes        
Smallmouth Bass All sizes        
Walleye All sizes        

DOWID - MN DNR, Division of Waters' lake ID number.

Contaminants listed were measured at levels that trigger advice to limit consumption.

Listing of consumption guidelines do not imply the fish are legal to keep, MN DNR fishing regulations should be consulted.

Dioxin
Mercury
PCBS - Polychlorinated biphenyls
PFOS - Perfluorooctane sulfanate


Status of the Fishery (as of 07/15/2013)

Mule Lake (DOW#11-371) is a 524.6-acre lake located south of Longville, Minnesota that has 7.31 miles of shoreline and a maximum depth of 47.0 ft. There is a public access owned by the Minnesota Department of Natural Resources (MNDNR) on the west shore of the lake. The MNDNR has classified Minnesota lakes into 43 different classes based on physical, chemical and other characteristics. Mule Lake is in Lake Class 23; other nearby lakes in this group includes Baby and Ponto lakes. Lakes in this class tend to be deep and have a low percentage of area less than 15 feet deep. These lakes also tend to have hard water and be very clear. An experimental Largemouth and Smallmouth Bass catch and release regulation was implemented on March 1, 2004. Following public input, it was later modified to an experimental 12 inch maximum size limit for both species. This regulation will be reviewed in 2015.

Northern Pike numbers were at an all-time high in the 2013 test netting but average sizes have decreased in recent years with the average Northern Pike sampled in 2013 near 19 inches long. Walleye abundance increased from the previous assessment to 4.44 fish per lift. Walleye abundance and sizes are within the ranges observed in similar local lakes. Yellow Perch numbers are low compared to other Class 23 lakes with the decrease in numbers corresponding with considerable increases in Northern Pike abundance since the mid-1990s. Smallmouth Bass numbers were lower than recent samples with the average fish measuring 16 inches long and fish up to 19 inches were sampled. Mule Lake supports an abundant population of Largemouth Bass, and fish up to 20 inches were captured during the 2013 survey. Bluegill numbers have been within or above the average range observed in similar area lakes. The average Bluegill in the 2013 sample was just under six inches with fish up to 9 inches being caught. Long range management goals are currently being met by the Black Crappie population in Mule Lake with fish up to 13.5 inches being caught.

Other species available for anglers include Brown Bullhead, Pumpkinseed Sunfish, Rock Bass, Tullibee (Cisco), White Sucker, and Yellow Bullhead.

People can have significant impacts on lakes and the fish populations they support. Harvest, lakeshore development, removal of shoreline vegetation, and introductions of invasive species can all adversely affect fish populations. Currently no aquatic invasive species (AIS) have been identified in Mule Lake. AIS are moved from infested to non-infested waters by anglers, boaters, and lake shore owners and can adversely impact lakes and fish populations. To avoid spreading AIS, lake users are required to remove all aquatic plants or animals from their watercraft and drain all water from their boat before leaving the access. If you suspect an infestation of an invasive species in this lake, save a specimen and report it to a local natural resource office. Additional information on all of these topics can be found on the DNR website (www.dnr.state.mn.us) or by contacting the Walker Area Fisheries office.


For more information on this lake, contact:

Area Fisheries Supervisor
07316 State Hwy 371 NW
Walker, MN 56484
Phone: (218) 547-1683
Internet: Walker Fisheries
E-Mail: Walker.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 C0151 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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