Lake Puckaway Fish Kill 09

Lake Puckaway
Fish Kill
2009
As presented by WDNR
Fish Kill - 2009
 Contacted by Warden Nate Ackerman


Friday evening – dead fish present on shore
Agreed to meet on Saturday morning
 Saturday morning


Met Warden Ackerman
Began to pick up and count dead fish
• More extensive than first thought
• Began a strategy to estimate fish numbers
Fish Kill Estimate
Method 1
 South Shore



Picked up dead game fish – 1308’
Counted dead gamefish – 848’
Estimated dead gamefish along 1.03 mi on
South shore, where dead fish were present
 North Shore

Counted dead gamefish - 0.8 mi
 These counts summarized to estimate
total gamefish mortality
Fish Kill Estimate
Method 2
 All fish counted in Holding net
 Based on assumption of (3) holding nets


These numbers x 3 to get estimate of total
mortality
Also taken into account were estimates of
delayed mortality for certain species
Lake Puckaway Fish Kill 09
5000
Sheepshead
W alleye
Black Crappie
Gizzard Shad
Carp
4500
4000
W hite Bass
Quillback
Channel Catfish
Northern Pike
Gar
3500
Number
3000
2500
2000
1500
1000
500
0
Count
E s tim a te
Ho ld in g Ne t x
3
Estimate M e thod
.2 5 M o rts
.5 M o rts
Gamefish sizes from South Shore Pick up
N
Min
(in)
Max
(in)
Mean
(in)
WE
421
14
28
21.3
WB
327
12.2
16.7
14.4
CC
215
12.2
29.8
14.7
NP
38
19.6
34.8
25.9
BC
3
12.6
13.8
13.2
Number of Walleye Mortalities Per Year Class
450
2001
400
Males (N=563)
Females (N=1437)
2004
350
Total (N=2000)
2007
Number
300
2006 2005
250
2003
200
150
1999
100
1998
2000
2002
50
1997 1996
0
2
3
4
5
6
7
8
Age (years)
9
10
11
12
13
Growth Rates of Female Walleye
30
Puckaway
Winnebago
25
Length (in)
20
15
10
5
0
0
2
4
6
8
10
Summers of Growth
12
14
16
18
20
Growth Rates of Male Walleye
25
Puckaway
Winnebago
20
Length (in)
15
10
5
0
0
2
4
6
8
10
Summers of Growth
12
14
16
18
20
Walleye CPUE of Fingerling Walleye FromTrawling Data (1990-2008)
25.00
CPUE of Fingerling Walleye
Catch Per Unit Effort
20.00
15.00
2001
2005
10.00
5.00
2007
0.00
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008
Year
F ry S to c k e d in L a k e P u c k a w a y 1 9 9 7 -2 0 0 7
3 .5
3
Number in Millions
2 .5
2
1 .5
1
0 .5
0
1997 1998
1999
2000 2001
2002
Ye a r
2003 2004
2005
2006 2007
What next?
 Spring Netting Scheduled for 2010


Look at walleye catch
Compare to historical information
 Assist Lake District with Walleye Wagon




Obtaining eggs
Operation
Marking of fry to evaluate
Future plans and surveys?
Questions?