Reference Terms
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Fish migration

Many types of fish undertake migrations on a regular basis, on time scales ranging from daily to annual, and with distances ranging from a few meters to thousands of kilometers.

The purpose usually relates to either feeding or breeding; in some cases the reason for migration is still unknown.

Salmon are capable of going hundreds of kilometers upriver, and human dams must install fish ladders to enable the salmon to get past.

Note:   The above text is excerpted from the Wikipedia article "Fish migration", which has been released under the GNU Free Documentation License.
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August 27, 2015

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