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A fish weir on the Pilgrim River to prevent fish from going downstream except when controlled by a gate

Sockeye Salmon Migrating at the Northern Edge of Their Distribution

The physiological challenge for anadromous fish to migrate upriver to spawn and complete their life cycle is influenced by river temperature.
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Alaska Science Center
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Sockeye Salmon Migrating at the Northern Edge of Their Distribution

The physiological challenge for anadromous fish to migrate upriver to spawn and complete their life cycle is influenced by river temperature.
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