brandon albrecht ron kegerries zach shattuck bio-west, inc
TRANSCRIPT
![Page 1: Brandon Albrecht Ron Kegerries Zach Shattuck BIO-WEST, Inc](https://reader038.vdocuments.net/reader038/viewer/2022103022/56649cd75503460f9499f246/html5/thumbnails/1.jpg)
LAKE MEAD RAZORBACK SUCKER MONITORING AND
RESEARCH: They’re Wild and They’re
Recruiting!
Brandon Albrecht
Ron Kegerries
Zach Shattuck
BIO-WEST, Inc.
![Page 2: Brandon Albrecht Ron Kegerries Zach Shattuck BIO-WEST, Inc](https://reader038.vdocuments.net/reader038/viewer/2022103022/56649cd75503460f9499f246/html5/thumbnails/2.jpg)
Acknowledgements
Lake Mead Workgroup
![Page 3: Brandon Albrecht Ron Kegerries Zach Shattuck BIO-WEST, Inc](https://reader038.vdocuments.net/reader038/viewer/2022103022/56649cd75503460f9499f246/html5/thumbnails/3.jpg)
StudyArea
![Page 4: Brandon Albrecht Ron Kegerries Zach Shattuck BIO-WEST, Inc](https://reader038.vdocuments.net/reader038/viewer/2022103022/56649cd75503460f9499f246/html5/thumbnails/4.jpg)
Background/Objectives Determine population size of Lake Mead
razorback sucker. Document Lake Mead habitat use and life
history characteristics. Document use of known spawning sites. Conduct sampling efforts for all life stages. Conduct long-term monitoring (1996-2012). Search for new population concentrations
(i.e., Colorado River Inflow Area). WILD FISH!
![Page 5: Brandon Albrecht Ron Kegerries Zach Shattuck BIO-WEST, Inc](https://reader038.vdocuments.net/reader038/viewer/2022103022/56649cd75503460f9499f246/html5/thumbnails/5.jpg)
Methods
Sonic telemetry (active and passive) Trammel netting Larval sampling Nonlethal age determination (fin rays) Population estimate
![Page 6: Brandon Albrecht Ron Kegerries Zach Shattuck BIO-WEST, Inc](https://reader038.vdocuments.net/reader038/viewer/2022103022/56649cd75503460f9499f246/html5/thumbnails/6.jpg)
2011 Long-term Monitoring 67 total net-nights (January–April 2011) 86 total captures, 14 recaptures (16.3%) = 72
new/wild captures600+ captured and tagged to date
73 individuals aged360 aged to date
72.6% (n = 53) were 7 years or younger Strong year-class for 2005 Total of 4,288 larval razorback collected from
long-term monitoring sites 5 wild juveniles
![Page 7: Brandon Albrecht Ron Kegerries Zach Shattuck BIO-WEST, Inc](https://reader038.vdocuments.net/reader038/viewer/2022103022/56649cd75503460f9499f246/html5/thumbnails/7.jpg)
To date:
107 wild, young, sexually immature (subadult) razorback sucker collected at Lake Mead.
The trend:
1996–1997 (2 years) = 4 subadults
1998–2005 (8 years) = 17 subadults
2006–2011 (6 years) = 86 subadults
![Page 8: Brandon Albrecht Ron Kegerries Zach Shattuck BIO-WEST, Inc](https://reader038.vdocuments.net/reader038/viewer/2022103022/56649cd75503460f9499f246/html5/thumbnails/8.jpg)
19
35
19
36
19
38
19
40
19
41
19
43
19
45
19
46
19
48
19
50
19
51
19
53
19
55
19
56
19
58
19
60
19
61
19
63
19
65
19
66
19
68
19
70
19
71
19
73
19
75
19
76
19
78
19
80
19
81
19
83
19
85
19
86
19
88
19
90
19
91
19
93
19
95
19
96
19
98
20
00
20
01
20
03
20
05
20
06
20
08
0
4
8
12
16
20
24
28
32
36
40
44
48
52
56
60
64
68
72
800
825
850
875
900
925
950
975
1000
1025
1050
1075
1100
1125
1150
1175
1200
1225
YEAR
Nu
mb
er
of
Ra
zorb
ac
k S
uc
ke
rs A
ge
d
Glen Canyon Dam Closes
Mo
nth
-en
d L
ak
e E
lev
ati
on
(ft
AS
L)
20
11
Recruitment nearly every year! Strong recruitment pulse around 2005; these fish are now adults. Expect recruitment to continue past 2008.
![Page 9: Brandon Albrecht Ron Kegerries Zach Shattuck BIO-WEST, Inc](https://reader038.vdocuments.net/reader038/viewer/2022103022/56649cd75503460f9499f246/html5/thumbnails/9.jpg)
Lake Mead Conditions, 2005 and 2011
Heavy winds and Large woody debris, bad for props
![Page 10: Brandon Albrecht Ron Kegerries Zach Shattuck BIO-WEST, Inc](https://reader038.vdocuments.net/reader038/viewer/2022103022/56649cd75503460f9499f246/html5/thumbnails/10.jpg)
Lake Mead Conditions Started at 1,092 ft. Jan 2011 and rose to 1,134 ft. Strong year class for 2011? Hope for the future!
1/1/
2005
4/1/
2005
7/1/
2005
10/1
/200
5
1/1/
2006
4/1/
2006
7/1/
2006
10/1
/200
6
1/1/
2007
4/1/
2007
7/1/
2007
10/1
/200
7
1/1/
2008
4/1/
2008
7/1/
2008
10/1
/200
8
1/1/
2009
4/1/
2009
7/1/
2009
10/1
/200
9
1/1/
2010
4/1/
2010
7/1/
2010
10/1
/201
0
1/1/
2011
4/1/
2011
7/1/
2011
10/1
/201
1
1/1/
2012
4/1/
2012
1075
1085
1095
1105
1115
1125
1135
1145
1155
Lake Elevation 2005-2012 Seasons
Date
Ele
va
tio
n (
Fe
et)
Historical lake levels recorded from January 2005-April 2012 (data from Reclamation 2012)
![Page 11: Brandon Albrecht Ron Kegerries Zach Shattuck BIO-WEST, Inc](https://reader038.vdocuments.net/reader038/viewer/2022103022/56649cd75503460f9499f246/html5/thumbnails/11.jpg)
Colorado River Inflow Area, 2011
![Page 12: Brandon Albrecht Ron Kegerries Zach Shattuck BIO-WEST, Inc](https://reader038.vdocuments.net/reader038/viewer/2022103022/56649cd75503460f9499f246/html5/thumbnails/12.jpg)
Colorado River Inflow
First Rapid
Second Rapid
North Beach
“Lunch Cove”
2011 spawning area 2010 spawning area
![Page 13: Brandon Albrecht Ron Kegerries Zach Shattuck BIO-WEST, Inc](https://reader038.vdocuments.net/reader038/viewer/2022103022/56649cd75503460f9499f246/html5/thumbnails/13.jpg)
Sonic-tagged fish enhanced our ability to capture wild razorback suckers,
helped identify the 2011 spawning area, and
increased our efficiency.
Limited upstream movement - fish stocked upstream returned to the lake.
Radio technology was useful but became irrelevant.
Telemetry Summary
![Page 14: Brandon Albrecht Ron Kegerries Zach Shattuck BIO-WEST, Inc](https://reader038.vdocuments.net/reader038/viewer/2022103022/56649cd75503460f9499f246/html5/thumbnails/14.jpg)
CRI Adult Sampling Total of 187 net nights (600% increase
from 2010).
Total of 15 razorbacks (8 recaptured, 7 new wild fish).
Total of 7 hybrids [razorback x flannelmouth] (1 recaptured, 6 new wild fish).
Total of 112 flannelmouth (39 recaptured, 73 new wild fish).
0.08 razorback/net night (0.04 new, wild fish/net night).
Single bluehead sucker also captured.
![Page 15: Brandon Albrecht Ron Kegerries Zach Shattuck BIO-WEST, Inc](https://reader038.vdocuments.net/reader038/viewer/2022103022/56649cd75503460f9499f246/html5/thumbnails/15.jpg)
CRI Larval Collections Total of 265 sampling events for a total of 146 light
hours.
First larval razorback sucker collected (Feb 14, 2011; temp 11.5° C).
Total catch of 65 larval razorback suckers (350% increase from 2010).
Captured 11 flannelmouth larvae for a CPM of 0.0013.
Catch per minute (CPM) value for razorback sucker larvae similar to those observed initially at MR/VR inflow.
CRI important spawning location for native suckers.
![Page 16: Brandon Albrecht Ron Kegerries Zach Shattuck BIO-WEST, Inc](https://reader038.vdocuments.net/reader038/viewer/2022103022/56649cd75503460f9499f246/html5/thumbnails/16.jpg)
19
35
19
36
19
38
19
39
19
41
19
42
19
44
19
45
19
47
19
48
19
50
19
51
19
53
19
54
19
56
19
57
19
59
19
60
19
62
19
63
19
65
19
66
19
68
19
69
19
71
19
72
19
74
19
75
19
77
19
78
19
80
19
81
19
83
19
84
19
86
19
87
19
89
19
90
19
92
19
93
19
95
19
96
19
98
19
99
20
01
20
02
20
04
20
05
20
07
20
08
20
10
20
11
0
0.5
1
1.5
2
2.5
3
3.5
800
850
900
950
1000
1050
1100
1150
1200
1250
Long-Term Monitoring (through 2011) Colorado River Inflow (through 2011) Lake Elevation
Year
To
tal N
um
be
r o
f Ra
zorb
ack
Su
cke
rs A
ge
d
Mo
nth
-En
d L
ake
Ele
vatio
n (
fee
t ab
ove
me
an
se
a le
vel)
Razorback Sucker Aging
Ages ranged from 6 to 11 (2000–2005)
![Page 17: Brandon Albrecht Ron Kegerries Zach Shattuck BIO-WEST, Inc](https://reader038.vdocuments.net/reader038/viewer/2022103022/56649cd75503460f9499f246/html5/thumbnails/17.jpg)
CRI Conclusions
Successful spawning has been documented and confirmed for the past two field seasons.
Wild, ripe razorback suckers were captured at different locations for two consecutive field seasons in the CRI.
Sonic-telemetry techniques can be used as an effective tool to help document razorback sucker habitat use in understudied areas of Lake Mead.
Hybridization of native sucker species has been documented.
![Page 18: Brandon Albrecht Ron Kegerries Zach Shattuck BIO-WEST, Inc](https://reader038.vdocuments.net/reader038/viewer/2022103022/56649cd75503460f9499f246/html5/thumbnails/18.jpg)
Why Lake Mead?
Unique population Young, recruiting, resilientPopulation estimate ~ 1000 fish
Unique habitatInflows – cover
Unique opportunityStudy recruitment (subadult fish)The importance of cover
Positive outlook for an endangered species
![Page 19: Brandon Albrecht Ron Kegerries Zach Shattuck BIO-WEST, Inc](https://reader038.vdocuments.net/reader038/viewer/2022103022/56649cd75503460f9499f246/html5/thumbnails/19.jpg)
Thank you!