TROUT IN THE CLASSROOM NEVADA DEPARTMENT OF WILDLIFE MASON VALLEY HATCHERY Yerington, Nevada.

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TROUT IN THE CLASSROOM

NEVADA DEPARTMENT OF WILDLIFE

MASON VALLEY HATCHERY

Yerington , Nevada

MASON VALLEY HATCHERY OUR HATCHERY

The hatchery began construction in 1988 and opened for production in 1990 at a cost of 8.1 million dollars with an annual cost of operation of $455,000 on average.

That breaks down to $2.00 per pound of fish, and .50cents per fish. The funding for this hatchery came from sales from the Verdi hatchery, trout

stamp sales, and federal matching funds. The Hatchery Crew

This is a full functioning facility, meaning we raise the fish from egg to liberation.

The hatchery has a crew of 5 employees: Supervisor Assistant Supervisor 3 Technicians

The technicians are given areas of responsibility throughout the hatchery.

MASON VALLEY HATCHERY The primary species raised

Pyramid Lake Cutthroat Trout Independence Cutthroat Trout (Heenan Lake, California) Sheep Creek Brown Trout (Gallagher Hatchery, Nevada) Tasmanian Rainbow Trout ( Gallagher Hatchery, Nevada) Eagle Lake Rainbow Trout ( Tenn. Or Montana NFH system) Erwin Rainbow Trout ( Tenn. Or Montana NFH system) Tahoe Rainbow Trout ( Marlette Lake, Lake Tahoe Nevada)

Our planting location around the state range from the upper most North West corner to Walker Lake.

TROUT IN THE CLASSROOMRainbow trout egg Daily Temperature Units (DTU’s)

-A Daily Temperature Unit (DTU) is defined as:

- Every 1°F above freezing (32°F) for a 24-hour period.

- - EXAMPLE: If the water temperature for a 24-hour period stays constant at 50°F, it would contribute 18 DTU’s. (50-32=18)

- EXAMPLE: If the water temperature for a 24-hour periodfluctuated from 48°F for 12-hours, and 50°Ffor another 12-hours this would contribute 17 DTU’s. (48-32)/(2)=8 + (50-32)/(2)=9

8+9=17Don’t worry about minor temperaturedifferences, for our purposes it is not that critical.

When When will will they they hatchatch?h?

TROUT IN THE CLASSROOMWater Temperature

35 °F 40 °F 45 °F 50 °F 55 °F

Rainbow Trout

Days to hatch - 80 48 31 24

DTU’s - 640 624 558 552

Brown Trout

Days to hatch 156 100 64 41 -

DTU’s 468 800 832 738 -

FACTORS EFFECTING EGG DEVELOPMENT

-Direct sunlight or UV light will effect the development of the eggs.

-The optimal thing to do is minimize there light exposure.

TEMPERATURE

-Fluctuation for developing eggs is a good thing within range.

2°F to 3°F is an optimal temperature variation.

OXYGEN

- The best condition for optimal egg development is at or near

100% saturation. To much Oxygen will cause gas bubble

disease. This is not a concern due to the systems we are using.

Cutthroat Trout Eggs

Eyed eggs 22 days old @ 47 Degrees F

Cutthroat Trout Alevin(sac fry)

Sac Fry35 days old@ 47 degrees F

Cutthroat Trout Sac Fry

Sac Fry in late development

44days@ 47 Degrees F

Cutthroat Trout Fry

Fry 55 days @ 47 Degrees F

TROUT IN THE CLASSROOM NEVADA DEPARTMENT OF WILDLIFE MASON VALLEY HATCHERY Yerington, Nevada.

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