Advancing Sustainable Aquaculture
Progressive Efforts to Conserve Water
at State Fish Hatcheries
Conserving Water Out of Necessity
December 2008
Presented by: Genny West
www.praqua.com
Northwest Fish Culture Conference 2008
Spokane, Washington
Reasons for Reusing Water
2
¾
Water shortages
¾
Competition for water resources
¾
Contaminated water supply
¾
Seasonal changes - water temp
¾
Reduced pumping and heating/cooling costs
¾
Increased control over the culture environment
¾
Minimize volume of effluent
Traditional Flow-Through Raceway System
Courtesy of Freshwater Fisheries Duncan
3
z
Difficult to flush solids
z
Not easy to clean
z
Plug flow – not great
mixing of oxygen
z
Low densities due to
crowding at one end
Circular Tank System
z
Excellent mixing of new
oxygenated water
z
Even temperature
distribution
z
Self-cleaning feed and
feces
z
Maximum volume
utilization
Courtesy of State of Wyoming - Wigwam
4
Intensive Water Reuse
Example of tank-side water reuse
Courtesy of Mainstream Canada
5
States Who Have Taken the Step…
State of Wyoming
Wigwam Hatchery – Reuses 5x the major water volume with gas stripping
and oxygen addition
Courtesy of State of Wyoming - Wigwam
6
Dan Speas Hatchery Upgrade – Phase One
Overall facility with raceways and
gassing/degassing
Courtesy of State of Wyoming – Dan Speas
7
Parallel LHO’s – Post
Degassing
Speas – Phase One
Vacuum Degassers – Dan Speas Fish Hatchery
Courtesy of State of Wyoming – Dan Speas
8
State of Wyoming
Dubois Hatchery
Story Fish Hatchery
Photos Courtesy of State of Wyoming
9
Chelan P.U.D and WDF&W
Partial Reuse System Pilot
Reasons For Pilot
10
¾
Mandated to increase production
¾
Could not rob the valuable water resource
¾
Solution: Reuse
¾
Results of pilot have been evaluated
Eastbank Fish Hatchery Pilot
11
Eastbank Fish Hatchery Pilot
Courtesy of Chelan P.U.D. - Eastbank
12
Eastbank Fish Hatchery Pilot
Solids Removal
Courtesy of Chelan P.U.D. - Eastbank
13
z
Reduce Biochemical Oxygen
Demand (BOD)
z
Prevent elevated ammonia
levels
z
Prevent direct damage to fish
gills
z
Improves overall water quality
Eastbank Fish Hatchery Pilot
Head to Head Fish Health Study
Circular Tank Reuse Vs Raceway
Courtesy of Chelan P.U.D. - Eastbank
14
Briefing on Recirculation
Recirculation
–
–
–
15
Between 95 to 98% of flow
Reduced cost of heating
Min. Required Processes:
¾ Solids Filtration
¾ Biofiltration
¾ CO2 Removal
¾ Oxygenation
Reuse
–
–
–
Between 50 to 75% of flow
Greater cost of heating
Min. Required Processes:
¾
Partial Solids Removal
¾
CO2 Removal
¾
Oxygenation
Fisheries Experiment Station
Logan, UT
June Sucker Restoration Efforts
Courtesy of State of Utah - Logan
16
Fisheries Experiment Station
June Sucker Restoration Efforts
Courtesy of State of Utah - Logan
Courtesy of State of Utah - Logan
17
Fisheries Experiment Station
June Sucker Restoration Efforts
Courtesy of State of Utah - Logan
Courtesy of State of Utah - Logan
18
Ruth Burnett Sport Fish Hatchery
Fairbanks, AK
19
Anchorage Sport Fish Hatchery Anchorage,
AK
20
Summary
¾
Sustaining Fisheries is dependent on water resources
¾
Quantity and quality of water are becoming serious
problems for fish culturists
¾
Reuse is becoming a necessity whether we like it or not
CONSERVE
21
ENHANCE
GROW
Advancing Sustainable Aquaculture
QUESTIONS?
What’s In Your Water?
PR Aqua Ltd.
Phone: (250) 714-0141
Toll Free:
(866) 714-0141
Fax:
(250) 714-0171
Email:
[email protected]
Website:
www.praqua.com