DNR Fish Survey

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Lake information report

Name: Weaver Lake

Nearest Town: Maple Grove
Primary County: Hennepin

Survey Date: 07/14/2008
Inventory Number: 27011700

Lake Characteristics

Lake Area (acres): 152.09
Littoral Area (acres): 76
Maximum Depth (ft): 57
Water Clarity (ft): 7
Dominant Bottom Substrate: N/A
Abundance of Aquatic Plants: N/A
Maximum Depth of Plant Growth (ft): N/A

Fish Sampled for the 2008 Survey Year

Species

Gear Used

Number of fish per net

Average Fish Weight (lbs)

Normal Range (lbs)

Caught

Normal Range

Black Crappie

Trap net

5.11

1.8 – 21.2

0.26

0.2 – 0.3

Gill net

3.17

2.5 – 16.5

0.35

0.1 – 0.3

Bluegill

Trap net

207.33

7.5 – 62.5

0.21

0.1 – 0.3

Gill net

8.33

N/A

0.22

N/A

Bowfin (dogfish)

Trap net

0.11

0.4 – 1.3

6.53

2.3 – 4.1

Common Carp

Trap net

0.22

0.4 – 2.0

ND

2.6 – 6.0

Golden Shiner

Trap net

0.56

0.2 – 0.8

0.12

0.1 – 0.1

Green Sunfish

Trap net

0.44

0.2 – 1.3

0.12

0.1 – 0.2

Hybrid Sunfish

Trap net

2.67

N/A

0.30

N/A

Largemouth Bass

Trap net

0.33

0.2 – 0.7

1.42

0.2 – 0.9

Gill net

0.17

0.3 – 0.8

1.65

0.4 – 1.0

Northern Pike

Gill net

5.67

1.5 – 7.3

5.67

2.0 – 3.5

Pumpkinseed

Trap net

2.56

0.7 – 4.2

0.25

0.1 – 0.2

Tiger Muskellunge

Gill net

0.17

N/A

15.44

N/A

Walleye

Gill net

0.17

1.2 – 6.3

4.53

1.2 – 2.7

Yellow Bullhead

Trap net

3.33

0.9 – 5.7

1.01

0.5 – 0.8

Gill net

4.50

0.5 – 7.5

1.14

0.5 – 0.8

Yellow Perch

Trap net

0.11

0.3 – 1.7

0.17

0.1 – 0.2

Length of Selected Species (Trapnet, Gillnet) Sampled for the 2008 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 crappie

5

47

10

2

0

0

0

0

65

bluegill

329

1579

0

0

0

0

0

0

1916

bowfin (dogfish)

0

0

0

0

0

0

1

0

1

common carp

0

0

0

0

0

0

0

0

2

golden shiner

0

5

0

0

0

0

0

0

5

green sunfish

2

2

0

0

0

0

0

0

4

hybrid sunfish

1

22

0

0

0

0

0

0

24

largemouth bass

0

0

1

2

0

0

0

0

4

northern pike

0

0

0

0

1

9

10

14

34

pumpkinseed

6

17

0

0

0

0

0

0

23

tiger muskellunge

0

0

0

0

0

0

0

1

1

walleye

0

0

0

0

0

1

0

0

1

yellow bullhead

0

4

14

39

0

0

0

0

57

yellow perch

0

1

0

0

0

0

0

0

1

Fish Stocking Activity

Fish Stocked by Species for the Last Ten Years

Year

Species

Size

Number

Pounds

2006

Tiger Muskellunge*

fingerlings

230

86.1

2001

Tiger Muskellunge

fingerlings

230

77.0

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.

Status of the Fishery (as of 07/14/2008)

Located in the city of Maple Grove, Weaver Lake is 149 acres in size. Historically, this lake contained a largemouth bass-bluegill-northern pike species composition, very typical of other small lakes in class 24. Hybrid muskellunge (tiger muskie) have been introduced to provide a bonus fishery. Stocking began in 1984 and continues with fish being stocked every third year. One tiger muskie 39 inches in length weighing 15 pounds was sampled during this survey.

Northern pike were sampled in average abundance for a class 24 lake and displayed very good size with an average length of 28.7 inches and average weight of 5.6 pounds. However, northern pike abundance is the lowest it has been in Weaver Lake since 1990.

Largemouth bass averaged 13 inches in length and weighed an average of 1.2 pounds. The size of largemouth bass in Weaver Lake is very good. This survey found an average abundance of largemouth bass compared to similar lakes. However, abundance of largemouth bass in Weaver Lake is the lowest it has been since 1985, when none were sampled.

One walleye measuring 24 inches and weighing 4.5 pounds was sampled. This fish was likely introduced by a private citizen illegally, as MN DNR Fisheries staff has not stocked Weaver Lake with walleye.

Weaver Lake displayed a diverse panfish community that includes bluegill, black crappie, green sunfish pumpkinseed and hybrid sunfish. Bluegills were very abundant. An improved size structure was seen in this survey. More than 86% were 6 inches or larger. Nearly 25% were 7 inches or greater, compared to 4% in the pervious survey. Average size also increased from 6.2 to 6.5 inches. Black crappie numbers are average for this type of lake and showed no significant change from last survey. Over 60% were larger than 8 inches, but less than 1% were larger than 10.

Yellow bullhead abundance has decreased to average levels. The average weight of these fish is over 1 lb, above average. Only one yellow perch was sampled, but this species has always been rare in Weaver Lake. Common carp abundance was low. One bowfin (dogfish) measuring 27.6 inches and weighing 6.53 pounds was caught. Golden shiners were sampled at an average abundance. ?