Fisheries Lake Survey

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Name: Murphy (Horseshoe)

Nearest Town: Central Lakes
Primary County: St. Louis
Survey Date: 08/10/2009
Inventory Number: 69064600
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Public Access Information

Ownership Type Description
DNR Concrete


Lake Characteristics

Lake Area (acres): 354.16
Littoral Area (acres): 261
Maximum Depth (ft): 24
Water Clarity (ft): 5.7

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


Did you know? Minnesota waters support 153 species of fish.

Fish Sampled for the 2009 Survey Year

Species

Gear Used

Number of fish per net

Average Fish Weight (lbs)

Normal Range (lbs)

Caught

Normal Range

Black Bullhead Gill net 0.12 0.3 - 6.8 0.14 0.3 - 0.6
Black Crappie Trap net 2.27 1.8 - 9.7 0.22 0.2 - 0.3
Gill net 1.25 0.6 - 5.1 0.28 0.1 - 0.3
Bluegill Trap net 18.91 2.4 - 16.0 0.10 0.1 - 0.3
Gill net 2.50 N/A 0.17 N/A
Largemouth Bass Gill net 0.25 0.2 - 0.7 3.32 0.4 - 1.4
Northern Pike Trap net 0.91 N/A 4.92 N/A
Gill net 3.88 1.2 - 5.7 3.47 1.6 - 3.3
Pumpkinseed Trap net 1.00 0.4 - 3.8 0.08 0.1 - 0.2
Walleye Trap net 0.18 0.3 - 1.3 5.50 0.4 - 2.0
Gill net 0.88 0.8 - 5.0 1.94 0.8 - 2.2
White Sucker Gill net 1.12 1.6 - 7.6 2.30 1.2 - 2.1
Yellow Bullhead Trap net 0.55 0.4 - 2.6 1.06 0.6 - 1.0
Gill net 0.75 0.3 - 2.0 0.92 0.4 - 0.8
Yellow Perch Trap net 0.18 0.5 - 2.1 0.11 0.1 - 0.2
Gill net 6.12 2.0 - 16.5 0.16 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 2009 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 1 0 0 0 0 0 0 1
black crappie 5 26 4 0 0 0 0 0 35
bluegill 170 56 0 0 0 0 0 0 228
largemouth bass 0 0 0 0 2 0 0 0 2
northern pike 0 0 1 0 10 11 14 5 41
pumpkinseed 11 0 0 0 0 0 0 0 11
walleye 0 1 1 1 2 3 1 0 9
white sucker 0 1 0 1 6 1 0 0 9
yellow bullhead 0 0 6 6 0 0 0 0 12
yellow perch 6 42 0 0 0 0 0 0 51


For the record, the largest Northern Pike (Silver Phase) taken in Minnesota weighed 18 lbs., 14 oz. and was caught:

    Where: Disappointment Lake, Lake County
    When: 6/28/78
    Statistics: 42" length, 19" girth

Fish Stocking Activity

Fish Stocked by Species for the Last Ten Years

Year Species Size Number Pounds
2013 Walleye fingerlings 13,000 520.0
2011 Walleye fingerlings 9,244 519.3
2009 Walleye* fingerlings 8,427 519.6
2007 Walleye* fingerlings 13,470 519.3
2005 Walleye* fingerlings 16,827 519.4

Privately Stocked Fish
* indicates privately stocked fish. Private stocking includes fish purchased by the DNR for stocking and fish purchased and stocked by private citizens and sporting groups.

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
MURPHY
St. Louis Co., 69064600
Crappie   All sizes     Mercury
Northern Pike   shorter than 23" 23" or longer   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
MURPHY
St. Louis Co., 69064600
Crappie All sizes        
Northern Pike   All sizes     Mercury
Walleye   All sizes     Mercury

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 08/10/2009)

Murphy is a 395 acre lake with 261 (66%) acres of littoral area and maximum depth of 24 feet. Murphy Lake is located just west of Central Lakes, MN off U.S. Highway #53 and has a state-administered, concrete, back-in public access. Murphy was last assessed in 2001. Murphy was assessed during the summer of 2009 to update information about fish populations.

Walleye fingerlings have been stocked into Murphy during odd numbered years since 1993. Walleye abundance of 0.9 per gillnet lift was up slightly from 2001 (0.8) and was average compared to other Minnesota lakes of similar type. Walleye average length was 16.2 inches, but not enough individuals were sampled to evaluate stock density or growth. All walleye aged corresponded to stocked year-classes.

A total of 30 largemouth bass were sampled by electrofishing. The catch rate of largemouth bass was 55.4 fish per hour of electrofishing on-time. Largemouth bass average length was 12.3 inches. One-third of the bass captured were greater than 16 inches in length. Length at age-4 of 11.5 inches represents average growth when compared to other Duluth Area lakes. All year-classes from 1999 through 2007 were represented.

Northern pike abundance of 3.9 per gillnet lift was down from 2001 (3.6) and average compared to other Minnesota lakes of similar type. Northern pike average length was 24.1 inches and 40% of the gillnet captured fish were greater than 28 inches in length.

Black crappie abundance of 2.3 per trapnet lift was up from 2001 (2.0) and was average when compared to other Minnesota lakes of similar type. Black crappie average length was 7.3 inches.

Bluegill abundance of 18.9 per trapnet lift was up from 2001 (7.2) and above average when compared to other Minnesota lakes of similar type. The 2009 bluegill catch rate was the highest recorded on Murphy of eight total investigations dating back to 1950. Average length of sampled bluegills was poor at 4.8 inches.

Yellow perch abundance of 6.1 per gillnet lift was down slightly from 2001 (7.7) and was average compared to other Minnesota lakes of similar type. Average length of perch was 6.9 inches.

Other fish species sampled include black bullhead, yellow bullhead, pumpkinseed sunfish and white sucker.


For more information on this lake, contact:

Area Fisheries Supervisor
5351 North Shore Dr
Duluth, MN 55804
Phone: (218) 525-0853
Internet: Duluth Fisheries
E-Mail: Duluth.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 C0561 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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