Coho Salmon

The coho salmon (*Oncorhynchus kisutch*) is an anadromous Pacific salmon species also known as the silver salmon.

The coho salmon (*Oncorhynchus kisutch*), also known as the silver salmon, is an anadromous Pacific salmon species found in the North Pacific Ocean and along the Pacific coast of North America and Asia. It returns to freshwater streams to spawn, and some populations have been introduced into inland waters such as the Great Lakes. While some coho salmon populations are healthy, others are listed as threatened or endangered.

Description

Coho salmon are medium-sized salmon with bright silver sides and a metallic blue or greenish back in marine waters. During spawning, adults become darker with reddish-maroon sides. Adults typically measure 24–30 inches (61–76 cm) in length and weigh 8–12 pounds (3.6–5.4 kg), though larger individuals have been documented.

Distribution and habitat

The natural range of coho salmon extends across the North Pacific Ocean, from Japan and Russia to Alaska and south to California. They inhabit coastal waters, rivers, and streams during different life stages. The species has also been introduced into the Great Lakes and some landlocked reservoirs.

Life cycle

Coho salmon spend their early life in freshwater, then migrate to the ocean to feed and grow. They return to their natal streams to spawn, typically from late summer to fall depending on the region. Coho salmon are semelparous, meaning they generally spawn once and then die.

Conservation

The conservation status of coho salmon varies by population and region. Some west coast populations remain robust, while others in California and elsewhere are listed as endangered or threatened under endangered-species laws.