Fisheries Lake Survey

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Name: Chub

Nearest Town: Carlton
Primary County: Carlton
Survey Date: 08/18/2014
Inventory Number: 09000800
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Public Access Information

Ownership Type Description
County Concrete Access is located on the north end of the lake, near Chub Lake park.


Lake Characteristics

Lake Area (acres): 313.42
Littoral Area (acres): 169
Maximum Depth (ft): 28
Water Clarity (ft): 6.9 (4.8-9)

Dominant Bottom Substrate: N/A
Abundance of Aquatic Plants: N/A
Maximum Depth of Plant Growth (ft): 11.2 (3-18)


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

Fish Sampled for the 2014 Survey Year

Species

Gear Used

Number of fish per net

Average Fish Weight (lbs)

Normal Range (lbs)

Caught

Normal Range

Black Bullhead Trap net 0.11 0.5 - 5.7 1.66 0.4 - 0.8
N/A Gill net 1.83 1.0 - 16.5 1.39 0.3 - 0.7
Black Crappie Trap net 12.89 0.8 - 4.3 0.10 0.2 - 0.5
N/A Gill net 10.33 1.0 - 4.8 0.19 0.2 - 0.4
Bluegill Trap net 8.00 8.3 - 50.1 0.07 0.1 - 0.3
N/A Gill net 1.83 N/A 0.21 N/A
Golden Shiner Gill net 1.33 0.4 - 3.6 0.10 0.1 - 0.2
Largemouth Bass Gill net 3.33 0.3 - 1.8 1.12 0.6 - 1.3
Northern Pike Trap net 0.89 N/A 2.72 N/A
N/A Gill net 11.00 4.8 - 12.5 2.07 1.4 - 2.5
Pumpkinseed Trap net 3.89 2.8 - 10.3 0.09 0.1 - 0.2
N/A Gill net 3.33 N/A 0.07 N/A
Rock Bass Trap net 1.33 0.5 - 1.5 0.12 0.3 - 0.5
N/A Gill net 4.33 0.3 - 1.2 0.29 0.3 - 0.5
Walleye Gill net 1.67 0.5 - 3.0 3.50 1.7 - 3.6
White Sucker Trap net 0.22 0.3 - 0.8 2.32 1.8 - 3.1
N/A Gill net 0.17 0.5 - 2.3 3.82 1.6 - 2.6
Yellow Perch Trap net 0.22 0.3 - 2.8 0.13 0.1 - 0.3
N/A Gill net 0.33 2.0 - 21.5 0.09 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 2014 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 2 9 1 0 0 0 12
black crappie 94 77 5 0 0 0 0 0 176
bluegill 72 10 0 0 0 0 0 0 82
golden shiner 1 6 0 0 0 0 0 0 7
largemouth bass 2 1 6 8 3 0 0 0 20
northern pike 0 0 2 8 19 33 9 0 71
pumpkinseed 50 4 0 0 0 0 0 0 54
rock bass 13 25 0 0 0 0 0 0 38
walleye 0 0 0 0 3 6 1 0 10
white sucker 0 0 1 0 0 2 0 0 3
yellow perch 0 4 0 0 0 0 0 0 4


For the record, the largest Silver Redhorse taken in Minnesota weighed 9 lbs., 15 oz. and was caught:

    Where: Big Fork River, Koochiching County
    When: 4/16/04
    Statistics: 26.6" length, 16 7/8" girth

Fish Stocking Activity

Fish Stocked by Species for the Last Ten Years

Year Species Size Number Pounds
2014 walleye2 fingerlings 10,120 337.3
2012 Walleye2 fingerlings 6,427 334.7
2010 Walleye1 fingerlings 5,066 337.7
2008 Walleye1 fingerlings 11,264 337.2
2006 Walleye1 fingerlings 1,231 107.1
  Walleye fingerlings 6,568 205.3

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
CHUB
Carlton Co., 09000800
Crappie All sizes        
Largemouth Bass   All sizes     Mercury
Northern Pike   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
CHUB
Carlton Co., 09000800
Crappie All sizes        
Largemouth Bass   All sizes     Mercury
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 08/18/2014)

Chub Lake is a 311 acre lake located near Carlton, Minnesota with 54% (169 acres) littoral area and a maximum depth of 28 feet. A state owned, concrete back-in access is located on the north end of the lake, near Chub Lake Park. Chub Lake was last surveyed in 2009. Chub Lake was assessed during the summer of 2014 to update information about fish populations and to evaluate the success of the walleye stocking program.

Walleye fingerlings have been stocked into Chub Lake during even years since 1992. Walleye abundance of 1.7 per gillnet lift was down from 2009 (9.2) but still considered average compared to other Minnesota lakes of similar type. Walleye average length was impressive at 21.0 inches and growth was slow when compared to other Duluth Area lakes. Only four year-classes from 2000 through 2010 were represented. Fifty percent of the walleyes aged were from the 2004 year-class. One-hundred percent of the walleyes aged corresponded to stocked year-classes suggesting limited, if any natural reproduction.

A total of 188 largemouth bass were sampled with electrofishing equipment. The catch rate of largemouth bass was 149.0 fish per hour of electrofishing on-time. Largemouth bass catch rates have been high on Chub, ranging from 125.9 in 2009 to 158.8 in 1999 over the last four investigations. Largemouth bass average length was 13.2 inches and growth was slow compared to other Duluth Area lakes. Largemouth bass growth rates have been decreasing over the last several assessments in Chub Lake. All year-classes from 2004 through 2012 were represented with strong 2007 and 2010 year-classes.

Black crappie abundance of 12.9 per trapnet lift was up from 2009 (5.0) and was above average when compared to other Minnesota lakes of similar type. Black crappie mean length was 5.7 inches and growth was slow compared to other Duluth Area lakes. All year-classes from 2007 to 2012 were represented with a strong 2010 year-class.

Northern pike abundance of 11.0 per gillnet lift was down from 2009 (15.2) and average compared to other Minnesota lakes of similar type. Average length was 20.2 inches. Northern pike were not aged for this assessment.

Bluegill abundance of 8.0 per trapnet lift was down from 2009 (9.3) and below average when compared to other Minnesota lakes of similar type. Average length of sampled bluegills was 4.3 inches. Bluegill were not aged for this assessment.

Yellow perch abundance of 0.3 per gillnet lift was down from 2009 (1.0) and was below average compared to other Minnesota lakes of similar type. Average length of perch was 6.3 inches, but not enough individuals were sampled to evaluate stock density or growth.

Other fish species sampled included black bullhead, golden shiner, pumpkinseed sunfish, rock bass and white sucker.

Water levels were up approximately two feet from the 2009 survey. Other lakes in the Nemadji River watershed (such as nearby Hay Lake) have also seen increases in water levels the last couple years.

Eurasion water milfoil was discovered growing near the boat launch by field staff during the 2009 survey. It appears as though the plant has expanded in the last several years as Eurasion milfoil stands were noted near several net locations. The DNR has designated the lake as infested waters and posted signs to notify those using the public water access. Designation of the lake as an infested water prohibits the transport of water and harvest of bait.

The regulation that prohibited fishing and recreational boating in the southeast bay from the opening of the general fishing season to June 30 was permanently removed in 2014. The regulation was intended to protect spawning largemouth bass. Recent assessments have shown that Chub Lake's largemouth bass population has become over abundant and is dominated by excessive stock sized fish and growth rates are at historic lows. With increasing population density, food availability per fish declines, leading to slower growth and poorer condition of the surviving fish. The removal of the regulation may allow increased harvest (or induced nest failure by catch-and-release angling) leading to a lower population density which may allow remaining fish to experience more rapid growth, eventually leading to an improved size structure for largemouth bass in Chub Lake.


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 B0488 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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