Trout life cycle
Sponsored Links
This presentation is the property of its rightful owner.
1 / 27

Trout Life Cycle PowerPoint PPT Presentation


  • 198 Views
  • Uploaded on
  • Presentation posted in: General

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.

Download Presentation

Trout Life Cycle

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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

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


Alevin or Sac Fry

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

It is called an alevin or sac-fry


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


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


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


Once the egg sac has been

absorbed, the

fry leave the gravel and become free- swimming.

Fry


  • The fry now has to forage for food.


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.

Chinook

Steelhead

Sockeye


Juveniles

Juveniles are small adults.

Most eventually lose their parr marks.


Adult rainbow


Adults spawning

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


Redd


Redd

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


How redds are built


…and it starts again….


  • Login