>('_') Salmon ('_')<

By: Evan Hall 5th Hour ASL

Native Salmon

Salmon are native fish to the northern pacific ocean, water quality for salmon inhabitants has to be pH 6.0-7.0. Temperatures required for an adult salmon ranges from 10-14 degrees Celsius (50-57 degrees Fahrenheit) and baby salmon require 4-8 degrees Celsius (40-46 degrees Fahrenheit), and in order to have the salmon babies they need a high oxygen to survive. Eggs, alevins, fry and adult salmon all are part of the life cycle of salmon. Adult salmon usually feed on smaller fish. The little salmon babies start of as eggs and usually, in the right temperature, hatch after 6-12 weeks , after hatching from the eggs the little salmon become alevins which are they derive their nourishment from the yolk sac of the egg from which they were born, and after they absorb the yolk sac they become fry. Fry is the next stage of the salmon life cycle, in this stage the fry will swim about feeding on tiny invertebrates and on the dead of the spawned out adults. Fry hide, deal with river currents, learn to school together and many other skills. The smolt comes next and smolting is a physiological change which which when completed enables the fish to live in salt water and not absorb the salt into their blood stream. When a salmon is at the stage of smolt it is ready to migrate down the river and the ocean. After the smolt stage the salmon becomes and adult and the fish undergo physical changes from bright silver to much darker and sometimes boldly colored mature adults. The energy the gained in the ocean is put solely into the production of eggs (females) and milt (males). Baby salmon are spawned where there parent's were spawned, up river in a fresh water area.
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Great Lake Salmon

The three salmon that currently live in the great lakes are the chinook salmon (oncorhynchus tshawtscha), coho salmon (oncorhynchus kistutch), and the pink salmon (oncorhynchus gorbuscha). The chinook salmon was introduced to the great lakes in the year of 1966 to try to reduce the amount of alewife. The coho salmon was introduced to the great lakes in the year of 1873, but there was no successful spawning until 1967, they choose to put the salmon into the great lakes because since the species are semelparity and hunted often the population needed to be increased to save the fish from extinction. The pink salmon was introduced to the great lakes in the late 1950's accidentally by a seaplane traveling over lake superior and about 100 were released at the time of the accident.

The triangles represent where the salmon are located!

More On Salmon In the Great Lakes

When salmon are born, they are born in freshwater and they are completely adapted to freshwater. Then they make their migration out toward the ocean. In the estuary (where freshwater and saltwater mix), they undergo a major life change called smoltification, which prepares them for life in salt water. Young salmon may spend up to several months making this change in the estuary. But after they have become smolts, they are adapted to salt water, and they will begin their life in the ocean, which may take several years, depending on the species. Adult salmon spawn in October and November using the inlet or outlet streams of their resident lake. Salmon are very important to our ecosystem because they provide a major amount of money to the local fish markets and since some salmon (chinook salmon) reduce the amount of alewife, which is good because alewife consume a majority of food for other fish to feed on. Smelt and alewives make up the chinook salmon, also young salmon eat aquatic insects. Little alevins feed off the yolk sacks for their consumption.Most salmon is consumed by humans because the great taste and the rich flavor contained inside.

Salmon in the Classroom

My idea for the salmon in the classroom is to release them into the wild, of course it would have to be in the right area for them to survive. Or the other option would be to give them to a foundation that helps salmon population increase. This program is great as it is, by raising salmon we have done so much for the environment, but my suggestion is that we should raise money to increase the number of eggs we buy and chances of putting more salmon in the great lakes of Michigan.


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