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Published bySamson Lane Modified over 9 years ago
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Trout Life Cycle
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Egg The egg is the first step in the life cycle of the trout.
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Just after fertilization eggs are very soft and sticky. They are called ‘green’ eggs.
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The source of energy for the embryo comes from the yolk. The developing embryo uses the yolk as its food.
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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.
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Zebra fish embryo
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Hatching
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Alevin or Sac Fry When the trout hatches from the egg, it retains its yolk sac. It is called an alevin or sac-fry
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The alevin also use the egg yolk as its food source.
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The alevin remain in the gravel until they reach the fry stage.
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These alevin are almost to the ‘button- up’ stage.
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Fry Once the egg sac has been absorbed, the fry leave the gravel and become free- swimming.
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The fry now has to forage for food.
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Parr -Parr are older fry that show special markings called ‘parr marks’. -Parr marks can be used as camouflage
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Parr marks can help identify small trout and salmon. Chinook Steelhead Sockeye
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Juveniles Juveniles are small adults. Most eventually lose their parr marks.
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Adult rainbow
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Adults spawning Females dig the depression (‘redd’) and lay their eggs. Males deposit the ‘milt’ with sperm to fertilize the eggs.
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Redd
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Redd The female buries the fertilized eggs as she digs more of the redd.
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How redds are built
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…and it starts again….
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