Fisheries Lake Survey

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Name: BLOCK

Nearest Town: URBANK, MN
Primary County: Otter Tail
Survey Date: 07/30/2001
Inventory Number: 56-0079-00
Buy your walleye stamp todayPurchase a walleye stamp. Your voluntary contribution will be used to support walleye stocking.

Public Access Information

Ownership Type Description
Minnesota DNR Concrete A STATE OWNED PUBLIC ACCESS IS LOCATED OFF OF COUNTY ROAD 6 ALONG THE NORTH SHORELINE OF THE LAKE.


Lake Characteristics

Lake Area (acres): 263.00
Littoral Area (acres): 132.00
Maximum Depth (ft): 23.00
Water Clarity (ft): 5.80

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 up to the 2001 Survey Year

Species

Gear Used

Number of fish per net

Average Fish Weight (lbs)

Normal Range (lbs)

Caught

Normal Range

Black Bullhead Gill net 132.6 0.8 - 7.7 0.55 0.4 - 0.8
Black Crappie Gill net 4.6 0.6 - 3.5 0.78 0.2 - 0.5
Bluegill Gill net 0.4 N/A - N/A 0.14 N/A - N/A
Northern Pike Gill net 1.6 3.5 - 10.5 2.74 1.6 - 2.9
Pumpkinseed Sunfish Gill net 0.8 N/A - N/A 0.13 N/A - N/A
Walleye Gill net 7.4 1.3 - 5.0 1.77 1.3 - 2.5
White Sucker Gill net 3.2 0.5 - 2.7 2.64 1.8 - 2.5
Yellow Perch Gill net 164.4 3.4 - 43.6 0.25 0.1 - 0.2
Normal Ranges represent typical catches for lakes with similar physical and chemical characteristics.


Length of Selected Species Sampled for All Gear for the 2001 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 1 28 258 0 0 0 0 0 287
Black Crappie 0 3 19 1 0 0 0 0 23
Bluegill 2 0 0 0 0 0 0 0 2
Northern Pike 0 0 0 0 0 5 3 0 8
Pumpkinseed Sunfish 4 0 0 0 0 0 0 0 4
Walleye 0 0 0 12 20 4 1 0 37
Yellow Perch 3 263 73 0 0 0 0 0 339


For the record, the largest Brown Trout taken in Minnesota weighed 16 lbs., 12 oz. and was caught:

    Where: Lake Superior, St. Louis County
    When: 6/23/89
    Statistics: 31.4" length, 20.6" girth

Fish Stocking Activity

Fish Stocked by Species for the Last Ten Years

Year Species Size Number Pounds
2013 Walleye fry 132,000 1.0
2012 Walleye1 fingerlings 4,704 245.0
2011 Walleye fry 132,000 1.1
2010 Walleye1 fingerlings 1,500 150.0
2009 Walleye fry 132,003 1.1
2008 Walleye1 fingerlings 1,000 83.3
2007 Walleye fry 132,000 1.1
2005 Walleye fry 132,000 1.1
2004 Walleye1 fingerlings 1,250 62.5

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

No fish consumption guidelines are available for this lake. For more information, see the "Fish Consumption Advice" pages at the Minnesota Department of Health.


Status of the Fishery (as of 07/30/2001)

Block Lake is a 263-acre mesotrophic (moderately fertile) lake located in southeastern Otter Tail County. The maximum depth is 23 feet and 50% of the lake is 15 feet or less in depth. Block lake is subject to winterkill during severe winters. The shoreline length is 3.0 miles and the secchi disk reading for this survey was 5.8 feet. Secchi disk readings, a measurement of water clarity, have ranged from 2.0 to 7.5 feet in previous lake surveys. A DNR owned public water access is located on the north shoreline of the lake. Development is low to moderate on Block Lake. Lakeshore development has been shown to negatively impact water quality by increasing nutrient levels and shoreline erosion. This can result in increased plankton/algae blooms, aquatic plant growth and suspended sediments, all of which can lead to decreased water clarity. By using best management practices (BMP's) and "lakescaping concepts", impacts of shoreline development and erosion can be minimized. Contact any county extension office for information on BMP's and you local DNR-Fisheries office for information on lakescaping techniques. Shoreline substrates consist primarily of sand and gravel. Some emergent aquatic plants such as hardstem bulrush and cattail are prevalent at various locations around the lake. These emergent plants provide valuable fish and wildlife habitat and are critical for maintaining good water quality. They protect shorelines and lake bottoms from erosion and can actually absorb and breakdown polluting chemicals. Emergent plants provide spawning habitat for fish species like northern pike, largemouth bass and panfish. They also serve as important nursery areas for all species of fish. Because of their important ecological value, emergent plants may not be removed without a DNR permit. A gill net assessment was conducted to evaluate the walleye, northern pike, and yellow perch populations. A spring trapnetting assessment was also conducted to analyze the black crappie population. These assessments documented good populations of walleye and black crappie in Block Lake. The DNR stocks walleye fry into Block Lake on a biennial basis. Age and catch data indicate that walleye fry stocking is producing good year classes. The 1997 and 1999 year classes appear to be strong and should provide good walleye angling for several years. The average length and weight of walleye was 16.7 inches and 1.8 pounds. Suitable spawning habitat exists for black crappie to produce good year classes. Age data indicate that black crappie reproduction is consistently good. The average length and weight of black crappie was 9.4 inches and 0.6 pound. Northern pike are present; however, abundance appears to be low. Yellow perch and black bullheads are very abundant. Anglers can maintain or improve the quality of fishing for all species of fish in Block Lake by practicing selective harvest. Selective harvest encourages the release of medium to large-size fish while allowing the harvest of the more abundant smaller fish for eating. Releasing the medium to large fish will ensure that the lake will have enough spawning age fish in the future and provide anglers with opportunities to catch large fish.


For more information on this lake, contact:

Area Fisheries Supervisor
1509 1st Ave N
Fergus Falls, MN 56537
Phone: (218) 739-7576
Internet: Fergus Falls Fisheries
E-Mail: FergusFalls.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 C2601 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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