TROUT IN THE CLASSROOM

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

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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)

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MASON VALLEY HATCHERY

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

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MASON VALLEY HATCHERY
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MASON VALLEY HATCHERY
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MASON VALLEY HATCHERY
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MASON VALLEY HATCHERY
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TROUT IN THE CLASSROOM
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TROUT IN THE CLASSROOM

• Rainbow trout egg Daily Temperature Units (DTUs)
• A Daily Temperature Unit (DTU) is defined as
• Every 1F above freezing (32F) for a 24-hour
  period.
• - EXAMPLE If the water temperature for a
  24-hour period stays
• constant at 50F,
  it would contribute 18 DTUs.
• (50-3218)
• - EXAMPLE If the water temperature for a
  24-hour period
• fluctuated from 48F for 12-hours, and 50F
• for another 12-hours this would contribute
• 17 DTUs. (48-32)/(2)8 (50-32)/(2)9
• 8917
• Dont worry about minor temperature
• differences, for our purposes it is
• not that critical.

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TROUT IN THE CLASSROOM

• When will they hatch?

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TROUT IN THE CLASSROOM
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TROUT IN THE CLASSROOM
FACTORS EFFECTING EGG DEVELOPMENT LIGHT -Direct
sunlight or UV light will effect the development
of the eggs. -The optimal thing to do is
minimize there light exposure.
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TROUT IN THE CLASSROOM
TEMPERATURE -Fluctuation for
developing eggs is a good thing within range.
2F to 3F is an optimal temperature variation.
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TROUT IN THE CLASSROOM
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.
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Cutthroat Trout Eggs

• Eyed eggs
• 22 days old
• _at_ 47 Degrees F

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Cutthroat Trout Alevin(sac fry)

• Sac Fry
• 35 days old
• _at_ 47 degrees F

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Cutthroat Trout Sac Fry

• Sac Fry in late development
• 44days
• _at_ 47 Degrees F

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Cutthroat Trout Fry

• Fry
• 55 days
• _at_ 47 Degrees F

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