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Lesson 17 How do fish reproduce and develop?

Lesson 17 How do fish reproduce and develop?. Did you ever own a fish tank? Did you raise guppies? Did you ever see a female guppy giving birth?. Fertilization in guppies takes place internally. The embryos develop internally, also.

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Lesson 17 How do fish reproduce and develop?

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  1. Lesson 17 How do fish reproduce and develop?

  2. Did you ever own a fish tank? Did you raise guppies? Did you ever see a female guppy giving birth?

  3. Fertilization in guppies takes place internally. The embryos develop internally, also.

  4. The young are born alive. The moment they are born, they are on their own. They swim off, search for food, and hide from danger.

  5. Most fish do not develop this way. In most fish, fertilization and embryo development are external.

  6. A female lays thousands, or even millions of eggs called roe. The depositing of unfertilized fish eggs is called spawning.

  7. The male swims over to the eggs and deposits a liquid called milt. Milt is a milky liquid that contains sperm. The free swimming sperm reach the eggs and fertilize them.

  8. Many zygotes are formed. As they get more developed, they become embryos.

  9. When the fish is developed enough, it hatches. A baby fish is called a fry. Attached to the fry is a yolk sac which feeds the fry.

  10. As the fry grows, the yolk sac shrinks. Soon, it is all used up and the fry must find its own food.

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