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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Egg

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



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.



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




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


Once the egg sac has been stage.

absorbed, the

fry leave the gravel and become free- swimming.

Fry



Parr stage.

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

-Parr marks can be used as camouflage



Juveniles
Juveniles stage.

Juveniles are small adults.

Most eventually lose their parr marks.



Adults spawning stage.

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


Redd stage.


Redd stage.

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




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