Sexual reproduction in salmon

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Pink salmon in their native range have a strict two year life cycle, thus odd- and even-year populations do not interbreed. Adult pink salmon enter spawning streams from the ocean, usually returning to the water course, or race, where they originated. Spawning occurs between late June and mid-October, in coastal streams and some longer rivers, and in the intertidal zone or at the mouth of streams if hyporheic freshwater is available. Using her tail, the female digs a trough-shaped nest, called a redd Scandinavian word for "nest" , in the gravel of the stream bed, wherein she deposits her eggs. As she expels the eggs, she is approached by one or more males, which fertilize them as they fall into the redd. Subsequently, the female covers the newly deposited zygotes, again with thrusts of her tail, against the gravel at the top of the redd.
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Five Questions About Genetically Engineered Salmon

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11 Advantages And Disadvantages Of Sexual Reproduction – alexandrapalconi.info

Sexual reproduction starts with the combination of a sperm and an egg in a process called fertilization. This can occur either inside internal fertilization or outside external fertilization the body of the female. Humans provide an example of the former whereas seahorse reproduction is an example of the latter. External fertilization usually occurs in aquatic environments where both eggs and sperm are released into the water. After the sperm reaches the egg, fertilization takes place. Most external fertilization happens during the process of spawning where one or several females release their eggs and the male s release sperm in the same area, at the same time.
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Do Fish Reproduce Sexually or Asexually?

Once confirmed, there are a series of recommendations to take into account to ensure the proper development of the embryo. For more about how do chickens mate and reproduce, as well as chicken egg hatching process , keep reading here at AnimalWised. A hen is born with all of her eggs, regardless whether or not a rooster is involved.
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Seahorses reproduce in an unusual way. The male seahorse becomes pregnant instead of the female. Most seahorse pregnancies lasts approximately 2 to 3 weeks.
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