Gregory Fischer, Facility Manager University of Wisconsin-Stevens - - PowerPoint PPT Presentation

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Gregory Fischer, Facility Manager University of Wisconsin-Stevens - - PowerPoint PPT Presentation

Dec 06, 2022 180 likes •397 views

Intensive Production of Walleye (Sander vitreus) and Hybrid Walleye in a Recycle Water System Utilizing a Domestic Broodstock Gregory Fischer, Facility Manager University of Wisconsin-Stevens Point Northern Aquaculture Demonstration Facility

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Intensive Production of Walleye(Sander vitreus) and Hybrid Walleye in a Recycle Water System Utilizing a Domestic Broodstock

Gregory Fischer, Facility Manager University of Wisconsin-Stevens Point Northern Aquaculture Demonstration Facility

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  • The UWSP-Northern Aquaculture Demonstration Facility (Bayfield, WI)

conducted a three year pilot project to evaluate and demonstrate commercially available new technologies for producing purebred and hybrid walleye for stocking and food fish.

Objectives

  • The project consisted of different areas including:
  • Intensive production and seasonal

advancement of captive walleye and sauger broodstock.

  • Production of large walleye (>300mm)(12inch)
  • n commercial feed for NR stocking.
  • Production of hybrid walleye to food

market size(454g)(1.0 pd) using intensive rearing and recirculation systems.

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Captive Broodstock

Winter period Coldbanking

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  • Manipulate water temperature
  • Human Chorionic Gonadotropin

(hCG)Hormone

  • 2 injections: 3-5 days apart
  • Females 500 IU/Kg
  • Males 350 IU/Kg

Seasonal Advancement of Spawning

Hormone Injection Method

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Out of Season Spawning

Photoperiod and Water Temperature Manipulation

  • Manipulate Water Temperature and Photoperiod
  • Overhead Lighting, Water Chiller and Boiler
  • Start August- set eggs- Early winter spawn(Feb)
  • Extend spawn into June
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Materials and Methods Incubation

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Materials and Methods

Experimental Tank Setup for Phase I-II Intensive Rearing

  • 240 L (60 gal) round tanks
  • Sidewalls painted black
  • Gray bottom
  • Adjustable lighting
  • Directional flow-thru

20ºC(70ºF) water (2-8 lpm)

  • Clay(old mine #4)(50-80 NTU)
  • 24 hr feeders
  • Surface spray
  • Removable screens
  • Daily cleaning system
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Surface spray Center screen Water inflow pipe

Directional water flow Feeder

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Otohime fry feed 200 -1400 m Nelson Silvercup walleye grower 1.0mm

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Materials and Methods

Recycle System Used For Phase III-IV Intensive Growout RAS Parameters:

  • 53,000 L water capacity
  • 33 m³ tank culture space
  • Fluidized sand biofilter
  • Drum Filter
  • Dual drain circular tanks
  • Oxygen cone
  • In sump electric heater
  • 23ºC (74ºF)Water temp.
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Results

Overall Survival Percentages Intensive Rearing

10 20 30 40 50 60 70 80 90 100

Phase and fish length % survival

0-38 mm 38-51 mm 51-102 mm 102-152 mm 152-239 mm

Phase I Phase II Phase III

48% 48% >90%

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Walleye/Hybrid Walleye: Cannibalism

  • Starts immediately
  • Unobserved mortality
  • Can account for low survival

rate in ponds and in indoor tanks

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Results Phase 1- Fry Culture

Unobserved Phase I Fry Mortality ie. Cannibilism

51% 10 20 30 40 50 60 Overall mortality %

Low Density High Density

33%

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Hybrid Walleye vs P urebred Walleye Growth in Weight

50 100 150 200 250 300 350 400 450 20 29 37 52 58 64 67 73 85 91 98 105 116 127 129 142 156 159 170 173 187 197 201 222 228 251 262 288 317 346 366

Days P os t Hatc h Grams

S E -10 S E -09 WE -10 WE -09

Phase I Early Lifestage Rearing

Phase III Growout in Recycle System

April March June Nov

Results

Growth Rates

Aug

Phase II

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1 year old Hybrid Walleye (1.0kg)

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Results

Extended Growout Growth Rates

Weight gain of Hybrid Walleye R eared in R ecycle S ys tem at 23 C

100 200 300 400 500 600 700 50 66 95 114 159 192 235 270 310 370 430 490 560 Days P ost Hatch Grams

Fingerling phase II DGR =0.5 g/day Growout phase III-IV DGR =1.4 g/day

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Results

1 2 3 4 FC TBWFD(%) 20 15 7.5 2 2 7 4 1.6 2 4 6 8 10 12 14 16 18 20 Growth Phase

Hybrid Walleye Feed Rates and Conversion Ratio

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Conclusion

  • Walleye and hybrid walleye

can be successfully reared indoors utilizing captive broodstock, early advanced spawning, incubation, and rearing techniques

  • Processing yields of >50%

and initial marketing studies indicate good aquaculture potential and high demand for hybrid walleye as food fish.

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Acknowledgements

We would like to thank Alan Johnson at the Rathbun Fisheries Research Center in Iowa for all his assistance and guidance. We would also like to acknowledge the efforts of NADF technicians Lance Bresette, Nate Martin. Dr. Chris Hartleb (Director) and Jim Held (Extension) have also provided assistance and guidance throughout this project. This project was supported by an Agricultural Development & Diversification grant through the Wisconsin Department of Agriculture, Trade and Consumer Protection. Mention of trade name, proprietary product, or specific equipment does not constitute a guarantee or warranty and does not imply approval to the exclusion

  • f other products that may be suitable.

QUESTIONS?????????????? http://aquaculture.uwsp.edu gfischer@uwsp.edu