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The spawn (eggs) of a clownfish. The black spots are the developing eyes. Spawn is the eggs and sperm released or deposited into water by aquatic animals. As a verb, to spawn refers to the process of freely releasing eggs and sperm into a body of water (fresh or marine); the physical act is known as spawning. The vast majority of aquatic and ...
Spawning triggers allow many fish to synchronize their breeding, making it more probable that individual fish will find a mate. In most cases, if these triggers were not present, male and female fish would not meet at the right stage and the number of offspring would be reduced.
All species of Pacific salmon (not including steelhead) die shortly after spawning. This one was photographed at a spawning site along Eagle Creek in Oregon.. The population of wild salmon declined markedly in recent decades, especially North Atlantic populations which spawn in the waters of western Europe and eastern Canada, and wild salmon in the Snake and Columbia River system in the ...
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This information helps salmon find their home river once they reach the coast from the open sea. In most cases, chemical cues from rivers are not thought to extend very far out into the ocean. Thus, salmon probably use two different navigational systems in sequence when they migrate from the open sea to their spawning grounds. [12]
Catadromous – fish that live their adult lives in fresh water lakes or rivers but migrate down rivers to spawn in the sea. An example are freshwater eels of genus Anguilla, whose larvae drift on the open ocean, sometimes for months or years, before travelling thousands of kilometres back to their original rivers (see eel life history).
They are thought to spawn in the sandy bottoms and shorelines of the rivers, lakes, and creeks where they live. Females are thought to produce anywhere from 100 to 2,600 eggs per spawning event. The mature age of a spottail shiner is around one or two years of age. The maximum age recorded for a spottail shiner to live is 5 years. [6]
Spawning success is often much better in channels than in adjacent streams due to the control of floods which in some years can wash out the natural redds. Because of the lack of floods, spawning channels must sometimes be cleaned out to remove accumulated sediment. The same floods which destroy natural redds also clean them out.