Fisheries Lake Survey

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Name: Maple

Nearest Town: Forada
Primary County: Douglas
Survey Date: 06/10/2013
Inventory Number: 21007900
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Public Access Information

Ownership Type Description
DNR Concrete
DNR Concrete


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): 830.87
Littoral Area (acres): 405.04
Maximum Depth (ft): 78
Water Clarity (ft): 20.6 (9-32.2)

Dominant Bottom Substrate: N/A
Abundance of Aquatic Plants: N/A
Maximum Depth of Plant Growth (ft): 8.0 (0-17)


Did you know? Lake rehabilitation projects reclaim waters suffering from habitat degradation and overpopulation of some fish species.

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 Bullhead Trap net 0.33 0.3 - 2.8 1.55 0.4 - 0.8
Gill net 0.42 0.6 - 9.5 1.07 0.5 - 0.8
Black Crappie Trap net 10.50 0.7 - 3.2 0.48 0.2 - 0.5
Gill net 1.08 0.5 - 2.7 0.20 0.2 - 0.4
Bluegill Trap net 24.75 5.6 - 42.3 0.26 0.1 - 0.3
Gill net 2.33 N/A 0.16 N/A
Bowfin (dogfish) Trap net 1.17 0.4 - 1.0 2.46 3.1 - 4.8
Gill net 0.67 0.1 - 0.4 2.94 2.9 - 5.0
Brown Bullhead Trap net 0.33 0.3 - 1.5 1.47 0.6 - 1.0
Gill net 2.17 0.3 - 2.2 1.30 0.6 - 1.0
Common Carp Trap net 0.17 0.2 - 1.1 8.85 3.0 - 7.8
Hybrid Sunfish Trap net 0.25 N/A 0.36 N/A
Gill net 0.08 N/A 0.18 N/A
Largemouth Bass Trap net 0.83 0.3 - 1.1 1.26 0.2 - 0.9
Gill net 0.42 0.3 - 1.2 1.10 0.5 - 1.1
Northern Pike Trap net 1.75 N/A 1.98 N/A
Gill net 20.50 3.1 - 8.5 1.42 1.5 - 2.7
Pumpkinseed Trap net 3.08 1.7 - 8.2 0.28 0.1 - 0.2
Gill net 1.25 N/A 0.20 N/A
Rock Bass Trap net 0.33 0.6 - 2.5 0.53 0.2 - 0.5
Gill net 0.08 0.3 - 2.0 0.58 0.3 - 0.5
Walleye Trap net 0.67 0.2 - 0.7 2.19 0.9 - 2.9
Gill net 9.50 1.3 - 5.5 1.00 1.2 - 2.4
White Sucker Trap net 0.17 0.2 - 1.0 1.85 1.7 - 2.9
Gill net 3.75 0.5 - 3.5 2.54 1.6 - 2.4
Yellow Bullhead Trap net 2.17 1.5 - 7.7 0.92 0.5 - 0.8
Gill net 3.00 0.9 - 10.0 0.87 0.5 - 0.7
Yellow Perch Gill net 1.67 2.5 - 24.2 0.18 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 bullhead 0 0 3 5 1 0 0 0 9
black crappie 6 53 78 2 0 0 0 0 139
bluegill 50 270 1 0 0 0 0 0 325
bowfin (dogfish) 0 0 0 2 10 10 0 0 22
brown bullhead 0 0 3 26 1 0 0 0 30
common carp 0 0 0 0 0 0 2 0 2
hybrid sunfish 0 4 0 0 0 0 0 0 4
largemouth bass 0 3 3 6 3 0 0 0 15
northern pike 0 0 1 33 157 59 17 0 267
pumpkinseed 7 45 0 0 0 0 0 0 52
rock bass 0 3 2 0 0 0 0 0 5
walleye 0 4 29 43 39 6 1 0 122
white sucker 0 0 2 3 36 6 0 0 47
yellow bullhead 0 3 34 25 0 0 0 0 62
yellow perch 4 15 1 0 0 0 0 0 20


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
2013 Walleye1 fingerlings 14,000 400.0
2012 Walleye yearlings 11,912 774.0
  Walleye1 fingerlings 5,000 500.0
  Walleye1 yearlings 7,200 400.0
2010 Walleye1 fingerlings 7,200 400.0
  Walleye yearlings 1,452 125.0
  Walleye fingerlings 11,381 655.0
2009 Walleye1 fingerlings 10,000 400.0
2008 Walleye fingerlings 3,446 101.0
  Walleye adults 55 29.0
  Walleye yearlings 11,804 650.0
2006 Walleye fingerlings 12,670 776.0
2005 Walleye 48,757 28.6
2004 Walleye yearlings 7,834 474.0
  Walleye yearlings 350 66.0
  Walleye adults 260 52.0

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
MAPLE
Douglas Co., 21007900
Bluegill Sunfish   All sizes     Mercury
Crappie   All sizes     Mercury
Largemouth Bass     All sizes   Mercury
Northern Pike     All sizes   Mercury
Walleye     All sizes   Mercury
White Sucker   All sizes     Mercury

General Population

LAKE NAME
County, DOWID
Species Meal Advice Contaminants
Unrestricted 1 meal/week 1 meal/month Do not eat
MAPLE
Douglas Co., 21007900
Bluegill Sunfish All sizes        
Crappie All sizes        
Largemouth Bass   All sizes     Mercury
Northern Pike   All sizes     Mercury
Walleye   All sizes     Mercury
White Sucker 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 06/10/2013)

Maple Lake is a moderate-sized (815 acres), clear water lake located approximately six miles south of Alexandria in Douglas County. The basin has a maximum depth of 78 feet and average depth of 16 feet. Due to Maple Lake's large bays, approximately half of the lake area is considered to be a littoral zone, which is that area less than 15 feet in depth. Maple Lake becomes thermally stratified during summer months. Dissolved oxygen concentration can be low enough to limit sustained occupation by game fishes below the thermocline. Depth to the thermocline can vary from 45 feet in early summer to 25 feet in August.

Water quality is very good. Water clarity averages 10 feet during summer months due to a small watershed area and comparatively low inputs of total phosphorus from runoff. Algal blooms can occur but are temporary and rarely severe. Bottom soils are largely sand. Silt and sediment deposits occur in the back of bays. The lake supports a diversity of submergent plants. Due to clear water, plants have been found growing to a depth of 17 feet. Yellow water lilies occur in sheltered areas along the western shoreline. Highly valued hardstem bulrush is largely confined to undeveloped shoreline.

Maple Lake supports abundant panfish and northern pike populations. Bluegill sunfishes and black crappies comprise most of the panfish harvest. Bluegills captured during the study averaged 6.8 inches. Only five percent of bluegills captured in trap nets were 8.0-inches or larger. These proved to be old fish. An 8-inch bluegill is 10-years-old. Black crappie catches were high during the 2013 survey in response to establishment of a very strong year class in 2009. These four-year-old fish made up 87% of the total crappie caught in trap nets and averaged 9.4 inches during the June survey. Elevated crappie abundance is also partially attributable to a crappie harvest regulation limiting daily harvest to five fish over 10 inches in total length.

The fish community is top heavy with predators. Northern pike are too abundant. Gillnet catches averaged 20.5 pike/net. Captures ranged from 11.0  30.0 inches and averaged 18.4 inches. Largemouth bass are less abundant, but due to limited fertility of the lake and stiff competition with other predators, bass grow slowly. Poor growth diminishes potential fishing quality in terms of size. The largest bass caught measured 16.9 inches. Average length of bass captures was 12.6 inches. Walleyes are stocked to satisfy demand for this popular fishery. Stocking performance and annual recruitment of young walleyes into the population has proven to be inconsistent. Catch statistics from the 2013 survey described a good walleye fishery. Walleye gillnet catches averaged 9.5 fish/net. This catch rate exceeds expectations from similar lakes in Minnesota. Average length of walleye captures was 14.0 inches. Relatively few 20 inch and larger walleye were measured. The largest walleye caught was 23.0 inches in length. This fish was estimated to be thirteen-years-old.

Harvest of the surplus of 21.0-inch and smaller pike would be beneficial to improve predator/prey balance and productivity of the fishery. Yellow perch, preferred prey for bass, pike, and walleyes, are in short supply. If faced with limited perch, predators will shift their diet to young of other gamefishes or less energy-efficient food sources. Young walleye are an acceptable alternative for perch.

Notes:

Maple Lake's clear water, close proximity to Alexandria, Glenwood, and Forada, and extension of central sewer lines around the lake have stimulated accelerated shoreline development and increased recreational use. Temporary declines in water quality are evident following weekends of heavy boating activity. Shoreline development has increasingly encroached into shallow bays and along shoreline supporting hardstem bulrush. Such habitat provides important spawning, nursery, and feeding sites for gamefishes. Anglers, recreational boaters, and shoreline property owners should be sensitive to cumulative impacts of aquatic resources and endeavor to minimize water quality degradation and habitat fragmentation.

Zebra mussels were found in Maple Lake in 2013. Property owners indicate this undesired invasive has successfully reproduced. Please drain boats, bait buckets, and other water containers when leaving the lake to reduce the risk of moving zebra mussels and other non-native organisms to uninfested waters.

Two improved public access sites are located on north and east shorelines. A handicapped accessible, floating fishing pier has been installed near the north boat launch for shore-based fishing experiences.


For more information on this lake, contact:

Area Fisheries Supervisor
23070 North Lakeshore Dr
Glenwood, MN 56334
Phone: (320) 634-4573
Internet: Glenwood Fisheries
E-Mail: Glenwood.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 C0980 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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    Toll-free: (800) 652-9093