Presentation on theme: "DEVELOPING THE WALLA WALLA HATCHERY Design criteria for maximizing survival."— Presentation transcript:
DEVELOPING THE WALLA WALLA HATCHERY Design criteria for maximizing survival
WALLA WALLA RIVER BASIN South Fork Walla Walla Adult Holding & Spawning Facility
Facility constructed in 1997 by BPA SOUTH FORK WALLA WALLA ADULT HOLDING & SPAWNING FACILITY Future Incubation and rearing location Designed to accommodate a future full production hatchery BPA acquired sufficient property to support construction of the required production facilities
EXISTING FACILITIES Site property (18 acres) Effluent settling pond Two residences Ozone water treatment Pumps and pipe sizing Water intake and screening Adult holding & spawning Existing water right of 21.15 cfs (9,497 gallons-per-minute)
PROPOSED SMOLT PRODUCTION - NEW SFWW HATCHERY - 500,000 juvenile spring Chinook. Localized Production - Incubate, rear, release @ 12 fpp. Est. SAR @ 0.55 ( Currently direct release 250 K ) ( Currently off-site @ via Carson NFH @ 17 fpp ) 2,750 est. hatchery returns (100% of sub-basin H goal) ( Current SAR ~ 0.24 ) ( Current hatchery returns ~650 or 24% of H goal ) Annual harvest goal = 2,000 – 2,500 ( All production to be 100% marked for harvest )
BIOPROGRAM METRICS No. 1 Objective = Maximize Survival ! Fish densities established at 0.66 lbs./ft 3 for early rearing (indoor) & 0.75 lbs./ft 3 for outdoor rearing. Density index target of 0.114 during maximum loadings on release date. Max. DI standard for Chinook – 0.20 (Piper, 1982 ) Max. density standard – 1.26 lbs / ft 3 DI target lower than: The new Chief Joseph Hatchery - 0.125 NEOH Lostine Hatchery – 0.13 Tucannon Hatchery (WDFW) – 0.13
BIOPROGRAM METRICS (cont’d) Production Needs: Incubator types proposed: Pros – reliability, accessibility, isolate, hatch Cons – accessibility, soft shell, disease control, not a consistent track record (i.e. experience with plugged nozzles, compressor overheating, water exchange Vertical Heath Trays Est. egg-take needs for program release goal = 616,000 (for 81% overall survival) Moist Air Incubators Pros – water budget, chilling, small footprint, reduced labor Cons – water budget /chiller demands, large footprint, labor intrusive large footprint, labor intrusive
BIOPROGRAM METRICS (cont’d) Est. No. fry to marking size @ 150 fpp for program release goal = 526,680 (95% survival from hatch). Total weight = 3,480 lbs. Early rearing containers proposed: Canadian double-deep style (35 ct.x 150 ft 3 ea.= 5,250 ft 3 ) Early/indoor rearing volume required @ 0.66 lb/ft 3 or a DI of 0.237 = 5,272 ft 3 ( 0.3 DI - NEOH )
Total lbs. / production @ release > 41,667 BIOPROGRAM VALUES (cont’d) 41,667 lbs. / 0.75 lb/ft 3 = 55,556 ft 3 final rearing volume needed Final rearing proposed: Concrete raceways (10’ x 90’ x 4’d) 55,556 ft 3 / 3,600 ft 3 = 15.4 – or – 16 total raceways
REARING REQUIREMENTS (cont’d) Peak facility flows for final rearing = 8,710 gpm ( ~545 gpm / raceway ) Lbs. / gpm = 4.8 ( common metric < 10 lbs. / gpm - per Piper, et. Al. )
DENSITY CRITERIA WHAT & WHY? Relationship between lower rearing densities and higher survival/adult contributions. Joe Banks density/survival study (USFWS, 1994-95) Spring Chinook. 1,200 ft 3 raceways of 20K – 40K – 60K ChS smolts DI’s of 0.16 – 0.32 – 0.48 @ 18 fpp Densities of 0.93 – 1.85 – 2.78 lbs./ft 3
RESULTS & DECISIONS Highest number of adult returns? 20K groups Lowest number of adult returns? 60K groups With flows adjusted in each group..... 200 – 400 – 600 gpm Fish reared on 600 gpm from each population group yielded highest number of adults.... BUT 20 k group on 200 gpm flow yielded more adults than any of the other higher density groups on 600 gpm.
RESULTS & DECISIONS (cont’d) Priority for low densities to give fish the greatest adult survival advantage, especially when poor post- release conditions are present. Second priority for low flow index, but based on the Banks study, is secondary to density for survival benefits. No. of rearing vessels based on these criteria will improve hatchery effectiveness.
RESULTS & DECISIONS (cont’d) Currently re-evaluating raceways v. circulars and effects on flows/velocities for improved exercise as it relates to increasing survival. Currently re-evaluating incubation types.