Trout life cycle
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Trout Life Cycle. Egg. The egg is the first step in the life cycle of the trout. Just after fertilization eggs are very soft and sticky. They are called ‘ green ’ eggs. The source of energy for the embryo comes from the yolk. The developing embryo uses the yolk as its food. Eyed-Egg.

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Trout Life Cycle

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Trout life cycle

Trout Life Cycle


Trout life cycle

Egg

The egg is the first step in the life cycle of the trout.


Trout life cycle

Just after fertilization eggs are very soft and sticky.

They are called ‘green’ eggs.


The source of energy for the embryo comes from the yolk

The source of energy for the embryo comes from the yolk.

The developing embryo uses the yolk as its food.


Eyed egg

Eyed-Egg

When the egg is in this stage it is more stable. The outer surface is harder than when the egg was first laid.

The egg is called an eyed -egg because the black dots you see are the eyes of the embryo inside.


Hatching

Hatching


Alevin or sac fry

Alevin or Sac Fry

When the trout hatches from the egg, it retains its yolk sac.

It is called an alevin or sac-fry


Trout life cycle

The alevin also use the egg yolk as its food source.


Trout life cycle

The alevin remain in the gravel until they reach the fry stage.


Trout life cycle

These alevin are almost to the ‘button-up’ stage.


Trout life cycle

Once the egg sac has been

absorbed, the

fry leave the gravel and become free- swimming.

Fry


Trout life cycle

  • The fry now has to forage for food.


Trout life cycle

Parr

-Parr are older fry that show special markings called ‘parr marks’.

-Parr marks can be used as camouflage


Parr marks can help identify small trout and salmon

Parr marks can help identify small trout and salmon.

Chinook

Steelhead

Sockeye


Juveniles

Juveniles

Juveniles are small adults.

Most eventually lose their parr marks.


Adult rainbow

Adult rainbow


Trout life cycle

Adults spawning

Females dig the depression (‘redd’) and lay their eggs. Males deposit the ‘milt’ with sperm to fertilize the eggs.


Trout life cycle

Redd


Trout life cycle

Redd

The female buries the fertilized eggs as she digs more of the redd.


How redds are built

How redds are built


And it starts again

…and it starts again….


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