Lake information report

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Name: Ojibway (Twin)

Nearest Town: Ely
Primary County: Lake
Survey Date: 08/13/2007
Inventory Number: 38064000

Public Access Information

Ownership Type Description
US Forest Service Portage
US Forest Service Concrete


Lake Characteristics

Lake Area (acres): 367.01
Littoral Area (acres): 134
Maximum Depth (ft): 115
Water Clarity (ft): 17

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


Did you know? MinnAqua Fishing: Get in the Habitat! has a Minnesota-base activity guide for teachers, scout and 4-H leaders, youth leaders, outdoor sports groups, or anyone interested in teaching others about habitat, stewardship and fishing.

Fish Sampled for the 2007 Survey Year

Species

Gear Used

Number of fish per net

Average Fish Weight (lbs)

Normal Range (lbs)

Caught

Normal Range

Lake Trout Gill net 0.33 0.4 - 3.7 1.58 1.5 - 4.0
Tullibee (cisco) Gill net 16.42 3.2 - 20.2 0.33 0.2 - 1.0
Normal Ranges represent typical catches for lakes with similar physical and chemical characteristics.


Length of Selected Species (Trapnet, Gillnet) Sampled for the 2007 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
lake trout 0 0 1 1 1 1 0 0 4
tullibee (cisco) 0 66 118 13 0 0 0 0 197


For the record, the largest Yellow Perch taken in Minnesota weighed 3 lbs., 4 oz. and was caught:

    Where: Lake Plantaganette, Hubbard County
    When: 1945

Fish Stocking Activity

Fish Stocked by Species for the Last Ten Years

Year Species Size Number Pounds
2010 Lake Trout yearlings 1,940 163.8
  Lake Trout yearlings 1,940 202.8
2008 Lake Trout yearlings 1,900 191.9
  Lake Trout yearlings 1,900 191.2
2006 Lake Trout yearlings 3,911 427.2
2004 Lake Trout yearlings 1,930 179.6
  Lake Trout yearlings 1,930 182.8

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
OJIBWAY
Lake Co., 38064000
Bluegill Sunfish   All sizes     Mercury
Cisco   All sizes     Mercury
Lake Trout     All sizes   Mercury
Northern Pike     All sizes   Mercury
Smallmouth Bass     All sizes   Mercury

General Population

LAKE NAME
County, DOWID
Species Meal Advice Contaminants
Unrestricted 1 meal/week 1 meal/month Do not eat
OJIBWAY
Lake Co., 38064000
Bluegill Sunfish All sizes        
Cisco   All sizes     Mercury
Lake Trout   All sizes     Mercury
Northern Pike   All sizes     Mercury
Smallmouth Bass   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 08/13/2007)

Ojibway Lake is in Ecological Lake Class 3, which consists of 72 lakes in northeast Minnesota that are very deep, have irregular shoreline shapes, and have very clear and soft (unmineralized) water. The trophic status of Ojibway Lake is between oligotrophic and mesotrophic.

Ojibway Lake was thermally stratified on 08/13/2007 with a surface temperature of 73 F and a bottom temperature of 40 F. In the west basin of the lake, adequate oxygen for trout (more than 5 ppm) was retained to a depth of 51 ft where the temperature was 42 F. Previous investigations have shown that in the central basin of the lake 5 ppm oxygen is retained to a depth of about 40 ft where the temperature is 40-45 F, and that in the eastern bay 5 ppm oxygen is retained only to a depth of 14 ft where the temperature is 55 F. Oxygen levels in cold water in 2001 were quite low in the west and central basins of Ojibway Lake, dropping below 5 ppm as shallow as 35 ft. The initial fisheries lake survey in 1950 considered Ojibway Lake to be a marginal lake trout lake based on its water quality.

The major inlet to Ojibway Lake, from Triangle Lake, has a short and steep watercourse with log jams and the remnants of a beaver dam at the head. The outlet, to Camp 20 Lake has a long, braided channel with a log jam at the head, the remnants of an old filter barrier downstream (built when Camp 20 Lake was being stocked with trout), and a cattail and grassy swamp area farther downstream. While these barriers may prevent upstream fish movement, they do not prevent downstream fish movement, as demonstrated by the movement of splake from Ojibway Lake to Camp 20 Lake after a 1991 stocking, and by the sudden appearance of walleye in Ojibway Lake in the 2005 investigation, presumably migrating from Triangle Lake. Lake bottom substrates along the shoreline of Ojibway Lake are mostly boulder, ledge rock, rubble, and silt. Aquatic plants in Ojibway Lake are sparse and grow to a depth of 12 ft; shoreline fringe plants are the most abundant, but northern milfoil, white waterlilies, and various pondweeds are also present.

There is a public access with a concrete boat ramp on Ojibway Lake at the site of the old Deer Trail Lodge on the north side of the lake. There were 49 private homes and cottages on the lake in 2005, up from 39 in 1981, 25 in 1969, and 5 in 1950. All of these homes and cottages are on the north and west sides of the lake and comprise about 30 percent of the shoreline; the remainder of the shoreline is U.S. Forest Service land. Many of the private homes and cottages were on Forest Service leased lots, but were recently privatized through a land exchange.

The purpose of the 2007 assessment was to evaluate the survival and growth of stocked lake trout yearlings by using 12 deep gillnets set in or below the thermocline at depths ranging from 25 ft to 85 ft and in water temperatures of 40-52 F. Fifteen previous investigations, dating back to 1950, each used 7-18 deep gillnets

Deep water fish populations in 2007 were dominated by moderate numbers of cisco and low numbers of lake trout. Burbot, another common coldwater fish species in the area, were observed in Ojibway Lake only in the 2005 investigation when one 22" specimen was captured.

Cisco numbers in 2007 (16.4/deep gillnet) were at the median value for all investigations on this lake. Cisco sizes in 2007 averaged 9.8", which was similar to sizes in previous catches on this lake. The largest cisco in 2007 was 13.5". Cisco are a rich forage fish and are responsible for the large size of some northern pike and lake trout in Ojibway Lake. Ojibway Lake is open for netting of bait-sized cisco under the ice each fall.

Lake trout numbers in Ojibway Lake have generally been low, but the 2007 lake trout catch of 0.3/deep gillnet was lower than the median catch of 0.7/deep gillnet in all investigations on this lake. Two of the four lake trout captured in 2007 were fin-clipped, indicating they had been stocked.

The two fin-clipped lake trout caught in 2007 were survivors of a paired stocking of Gillis Lake strain and Mountain Lake strain yearlings in May of 2004 at the average length of 7.0". Both were Gillis Lake strain trout with a right ventral clip. One had grown only to a length of 9.8" in the 39 months since being stocked. Although lake trout growth in Ojibway Lake has historically been slow, the growth of this individual was extremely slow. The stomach of this trout was empty. The other Gillis Lake strain trout was 14.6", and exhibited growth that was faster than normal for this lake, but was typical of four year old lake trout in area lakes.

No trout were caught from the 2006 yearling stocking (Gillis strain with adipose-right ventral clips and Mountain Lake strain with adipose-left ventral clips).

One unclipped lake trout was age 7, and at 16.2" was smaller than the median length of 18.0" for age 7 trout in area lakes. The other unclipped trout was age 9, and at 21.9" was smaller than the median length of 23.2" for age 9 trout in area lakes.


For more information on this lake, contact:

Area Fisheries Supervisor
650 Hwy 169
Tower, MN 55790
Phone: (218) 753-2580
Internet: Tower Fisheries
E-Mail: Tower.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 C5075 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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