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Chinook Salmon - School Essays

Chinook Salmon

Environmental Science Wednesday, February 26, 1997
Among the many kinds of fish harvested each year by commercial fisheries is the
Oncorhynchus tshawytscha or . The United States catches an
averages of about three hundred million pounds of salmon each year. However
some Chinook salmon have been recently listed as threatened. Man has been the
main cause for the decline in Chinook salmon populations.

The populations of Chinook salmon have declined for several reasons. Hydropower
and it's destructiveness to the environment, pollution, and overfishing are the
three main causes for the decline. The Chinook salmon is known for traveling
the greatest distance back to its spawning grounds, ...

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by the giant turbines on their way back to the ocean.
Killing off many of the salmons new generation. Pollution is also a killer of
many Chinook salmon. Pollution caused by sewage, farming, grazing, logging and
mining find it's way into our waters. These harmful substances kill many
species of fish and other marine life. The Chinook salmon is no exception. The
chemicals are dumped into the rivers and streams and eventually these chemicals
find their way to the ocean, polluting and effecting each area they pass through.

The largest contributor to the decline in the Chinook salmon population is the
commercial fishing industry. From a period of 1990-1992 815,000 Chinook salmon
were caught by commercial fisheries. This does not include the 354,000
recreational catches. Commercial fishing is a big industry. Commercial fishers
use nets, which they pull by boats. Some nets are designed so the holes in the
nets are large enough for the head of the fish to fit through, and then ...

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PAPER DETAILS

Added: 12/22/2004 06:11:49 PM
Category: Science & Nature
Type: Premium Paper
Words: 601
Pages: 3

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