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ITS THE WATER

TheHatchery

Nurserypond

From more than *** feet deep inResurrection Bay seawater is pumpedto the nursery pond and the hatcherywhere it is treated and used.

The nursery pond ismanaged to produce algaeas feed for holding youngshellfish seed produced bythe hatchery. The seed isthen

sold for shellfish farmers.

Water to the hatchery istreated and put to usefor a number of purposes.

A complex system ofpipes and hoses deliver

treated water to the tanks.

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ITS THE WATER

Water used in the hatcherymust first be cleaning bythis dual set of filters thatRemove particles down to10 m.

Filtered water is sterilizedwith this ultraviolet lightunit to kill bacteria, fungiand viruses that can harmor compete with the algaeand delicate shellfish larva.

Filtration Sterilizatio

n

Heating

The saltwater from deep in Resurrection Bay remains at anearly consistent temperature of 5 degrees centigrade.This diesel boiler and heat exchanger heat the water to ***

necessary for conditioning of broodstock, algae culture,and shellfish larva rearing.

BoilerHeat exchanger

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A SHELLFISH HATCHERYMimicking Nature

Growing the food

Growing live algae to feedthe shellfish is a complexexpensive process.

The Broodstock

Sexually mature adults, calledBroodstock, are conditionedwith warm water and lots offood to produce and spawneggs and sperm into the water.

Each of the 8 species of algae isgrown separately, but mixed withother algae species before Feeding,toprovide a balanced diet.

These oyster broodstock,like most shellfish, canbe conditioned to spawnat any time of year.

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GROWING LARVA

These tall 16, 000 liter (4,227 gallon)can rear 40 million microscopicshellfish larva each for the threeweeks required form them todevelopinto their adult life form

The microscopicD veliger larvadevelops after theshellfish egg hatches

Three weeks later theumbo veliger stage larvaare ready to settle to thebottom and transform intotheir adult life form.

Tank filled with millions oflarva and live algae feed

Every three days during the twoweeks of larva rearing the tank isdrained, the larva filtered out, and putback into A clean tanks of sterilized

sea water and algae feed

Picture of filteringlarva

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TRANSFORMING

TO A SPAT

Downweller/upwellertanks

At the proper size, the shellfish larva are transferred to thesesmaller tanks with water is first downwelled (flowing fromthesurface through the screened bottom, the larva set and form

their adult live phase, then the water is upwelled (flowing inthereverse direction. ) and provided food for further growth.

Downweller with thousandsof shellfish spat, nowtermedseed.

After food is supplied andin the upweller, the seed aregrown to about 2-3 mm inlength then placed in thenursery pond or sold tofarmers

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THE SEED

Oysters

Cockle Geoduckclam

Purple hingerock scallop

Littleneckclam

Pacificoyster

Effluent treatmentAll water returned toResurrectionBay is sterilized to protect theBay from any biological pollutionThat hatchery could produce.