Population Dynamics Among NC Reservoir Striped Bass Stephen W. - - PowerPoint PPT Presentation

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Population Dynamics Among NC Reservoir Striped Bass Stephen W. - - PowerPoint PPT Presentation

Jan 12, 2024 101 likes •530 views

Population Dynamics Among NC Reservoir Striped Bass Stephen W. Parker and Jesse R. Fischer NC Wildlife Resources Commission Christian Waters Corey Oakley Michael Fisk Kirk Rundle Lawrence Dorsey Kelsey Lincoln

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SLIDE 1

Population Dynamics Among NC Reservoir Striped Bass

Stephen W. Parker and Jesse R. Fischer

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SLIDE 2

NC Wildlife Resources Commission

  • Christian Waters
  • Corey Oakley
  • Michael Fisk
  • Kirk Rundle
  • Lawrence Dorsey
  • Kelsey Lincoln
  • Jessica Baumann
  • Kin Hodges
  • Chris Wood
  • Powell Wheeler

NCSU

  • Tyler Craft
  • Eric Torvinen
  • Spencer Gardner
  • Joseph McIver
  • Bobby Cope
  • Wilson Xiong
  • William Wood
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Striped Bass (Morone saxatilis)

  • Largest and longest-lived of

the genus Morone

  • Original range:
  • St. Lawrence River to northern

Florida

  • Gulf Coast
  • Distributed across nearshore

waters, bays, and coastal rivers

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SLIDE 4

Introductions and Early Management

  • Unsuccessful introduction

effort NJ (1930’s)

  • First isolated, reproductively

successful populations

  • Santee-Cooper, SC (1952)
  • Kerr Lake, NC (late 1950’s)
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SLIDE 5

Introductions and Early Management

  • Hatchery and stocking techniques

developed during the peak of reservoir construction

  • By 1981, established in at least 279

reservoirs in 34 states

  • $24.6 billion USD (USFWS 2011)
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SLIDE 6

Research Objectives

➢Assess reservoir Striped Bass populations and associated fish assemblages ➢ Compare sampling methods to standardized protocols ➢ Determine population characteristics and estimate dynamic rate functions (e.g., growth, mortality)

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SLIDE 7
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SLIDE 8

Reservoir Surface Area (acres) Shoreline Length (mi) Avg Depth (ft) Max Depth (ft) Elevation (ft) Completion Year Drainage Area (sq mi) Water Volume (acre-ft) Badin

5,350 115 90 190 509.8 1917 4,180 129,100

Gaston

20,300 350 40 95 200 1963 8,340 450,000

Hickory

4,100 105 33 85 931 1927 1,310 137,821

High Rock

15,180 365 16 52 655 1928 3,973 234,866

Hiwassee

6,275 163 142 308 1,521 1940 968 205,590

Jordan

13,940 200 14 38 216 1982 1,690 215,130

Lookout Shoals

1,270 39 30 69 835 1916 1,449 24,995

Rhodhiss

3,515 90 20 52 995 1925 1,090 70,300

Roanoke Rapids

4,600 47 16 99 132 1955 8,294 77,100

Tillery

5,263 118 32 72 279 1928 4,834 167,817

Tuckertown

2,560 75 16 55 565 1962 4,210 6,700

  • W. Kerr

Scott

1,475 55 28 65 1,030 1962 367 41,000

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Gill Nets

Fish are caught by being:

  • Wedged
  • Gilled
  • Tangled
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Fish Sampling

  • Experimental gill nets
  • 200 ft (61 m) long, 8 ft (2.4 m)

deep, 4 x 50 ft (15.2 m) panels

  • Randomized bar mesh order: 1.5”,

2.5”, 3”, 2”

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Fish Sampling

  • Lengths and weights

recorded for all fish

  • Sagittal otoliths taken for

Striped Bass

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Age and Growth

  • Otoliths aged by a

single reader

  • Distances between

annuli measured

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SLIDE 15

Sampling Design

  • Systematic Random Sampling
  • 80 shoreline segments
  • Randomly selected reaches
  • 60 – 80 net nights
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SLIDE 16
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Project Summary

  • 873 total net nights of effort
  • 22,988 fish measured
  • 1017 Striped Bass caught
  • 2017: 308
  • 2018: 709
  • 9 of 12 possible reservoirs sampled
  • 3 repeat sampling events (2017-2018)
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SLIDE 18

2.78 1.71 1.48 1.31 2.24 0.31 0.69 0.28 1.41 0.78 1.21 0.60 NN=60 NN=62 NN=66 NN=80 NN=62 NN=80 NN=62 NN=80 NN=71 NN=80 NN=80 NN=90*

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SLIDE 19

N = 167 N = 98 N = 43 N = 106 N = 105 N = 22

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SLIDE 20

Badin Hickory Lookout Gaston High Rock Tuckertown Jordan Tillery Roanoke N = 106 N = 105 N = 22 N = 139 N = 25 N = 97 N = 100 N = 53 N = 62

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Non-native Species

  • Importance of Biodiversity
  • Introduced Species
  • Striped Bass
  • Largemouth Bass
  • Invasive Species outcompete native

species and commonly lack predators

  • Common Carp
  • Flathead Catfish
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N = 964 Species Richness = 18

2nd

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N = 993 Species Richness = 20

4th

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N = 2606 Species Richness = 16

13th

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SLIDE 29

10th

N = 1643 Species Richness = 25

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SLIDE 30

6th

N = 2719 Species Richness = 20

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SLIDE 31

6th

N = 1201 Species Richness = 19

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SLIDE 32

7th

N = 1510 Species Richness = 19

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SLIDE 33

11th

N = 3332 Species Richness = 18

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SLIDE 34

11th

N = 2824 Species Richness = 20

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SLIDE 35

6th

N = 1695 Species Richness = 23

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SLIDE 36

7th

N = 1774 Species Richness = 19

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SLIDE 37

10th

N = 1727 Species Richness = 21

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SLIDE 38

Summary

  • Similar assemblage structure and

predominant species across reservoirs

  • Variation in Striped Bass size structure

among reservoirs

  • Little interannual variation observed
  • High species richness for gill net

sampling

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High Rock Summary

  • Maximum Effort
  • 4th most fish caught
  • Lowest Species Richness
  • Few Striped Bass
  • Second lowest catch rate
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Future Direction

  • Additional assessment of important

reservoir characteristics

  • Prey assemblage and population

characterization

  • Incorporate historical Striped Bass

information from reservoirs

  • >3000 otoliths from 2004 – present
  • btained from NCWRC staff
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Future Direction

  • Reservoirs to be sampled in 2019
  • Third Year: Jordan, Gaston, Badin
  • Second Year: Hickory, Lookout, Tuckertown
  • First Year: Rhodhiss, W. Kerr Scott, Hiwassee
  • Reservoirs not sampled again:
  • High Rock, Tillery, Roanoke Rapids