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Copy of Biology
Transcript of Copy of Biology
Salmon live in both fresh and salt water. When the are just born they live in fresh water until they swim to the ocean where they will spend anywhere between one to five years in some cases ten years. Then they swim back to the river they were born in. There they lay their eggs that create the next generation of salmon.
In China and the western Pacific, the salmon distribution is patchy but they are consistently present only in Kamchatka. In North America, they travel inland, mainly because of dams and habitat alterations.
Salmon eat different things at different times of their life. When they are babies swimming to the ocean, they eat the waste on the bottom of the river. When the salmon are in the ocean they eat aquatic animals, like tadpoles, squid, and smaller fish. When they start their journey back to their birth place they don't eat.
Salmon live on average two to seven years depending on the species. Some species can live up to ten years. Chinook salmon live an average of three to six years
Chinook Salmon weigh ten to 50 pounds on average. The record weight was 97.25 pounds.
The Chinook is blue-green,red or purple on the back and top of the head with silvery sides and white on the belly. It has black spots on its tail and the upper half of its body..
Most salmon born in freshwater (rivers or streams), travel to and live much of their lives in salt water and return to freshwater to spawn. After spawning, all Pacific salmon die within a few weeks.
A Salmon's Cycle!
The average length of a salmon is twenty-four to thirty-six inches. The record length was fifty-eight inches.
Just for Fun
Salmon have many enemies. The bears find the salmon for food after a long winter hibernation. Eagles grab them the first chance they have. And we humans hunt them for sport and a tasty dinner. Dams are a major killer both when the salmon are babies and when they go to spawn.
After the salmon's years in the ocean, it swims back up stream to where it was born to spawn. When it arrives, it digs its redd, or nest, and lays its eggs while the male fertilizes them in order to start the cycle over.
When the female salmon leaves her eggs, the eggs stay in their redds, also called nest, for six to twelve weeks.
After the eggs hatch, they are called Alevins and they live in the gravel where they were born. They feed on their yolk sac for a few weeks until it runs out. It is then that they begin the fry stage.
The fry swims in the river near their birth place and feed off their dead parents bodies.
After the fry stage the salmon become a smolt and begins to adapt for his new salt water home. Then he starts his journey to the ocean.
When the salmon is in the ocean he matures for one to five years .
After the salmon mature they will return to the waters where they were hatched to reproduce.
Before the long journey, salmon feed and readjust to fresh water.
Then salmon begin the trip upstream to spawn. Salmon often have to navigate fish ladders and other man made obstacles along the way.
They also have to jump up many waterfalls. Only 1-10 of the 1,500 salmon born survive.
The Journey Home
by Ketrin and Tabitha
The parr is the stage after the fry where it develops stripes and continues to feed. They are 3-12 inches at this point.
There is only one species Atlantic salmon but six Pacific species.
Salmon can travel up to 3,500 miles to spawn.
As food, salmon are full of essential vitamins and can lower the risk of certain cancers.
Rainbow trout, steel head trout and Pacific salmon are all the same thing.
The Chinook salmon is Oregon's official state fish.
Types of salmon
The six main types of pacific salmon:
Why save the Salmon?
If the salmon disappeared from our environment, then we would have many problems. Everything from not being able to enjoy salmon for dinner to whole forest dying off from lack of the nutrients provided by the decaying salmon.