Anchorage, Alaska — Northwest
Coho Salmon Life Cycle
Most coho migrate to sea after one or two years in fresh water.
Sept 1-Nov 15 The adult cohos are the last of the Pacific salmon to arrive in the river to spawn.
Nov 15-April 1 The eggs incubate over the winter.
April 1-May 1 In the spring, the alevins emerge from their eggs, using the remnants of the yolk as a portable food source.
May 1-June 1 Even though 90% of the eggs are fertilized, only 20% of the fry survive.
June 1-July 1When the smolt go the ocean they are well developed and better equipped to survive than other salmon smolts.
July 1-July 15 After feeding and growing in the ocean for up to 2 years, the adults return to spawn and complete the cycle.
July 15-August 31 Adults gather near their natal stream in preparation for spawning.
Growth Stages of Coho Salmon-Each female lays approximately 3800 eggs
–Note the orange egg sac that the alevin uses for food
—Twenty percent of the fertilized eggs develop into the fry stage
—After spending up to four years in fresh water, fry develop into smolts that
—Coho are excellent jumpers. They have been known to clear waterfalls over two meters (over six feet) tall. Spawning adults turn bright red and are often confused with spawning sockeye salmon. To tell the difference, look for the hump on male sockeyes and the greenish backs on the adult cohos. Some people call coho “silver salmon.”
Topics. This historical marker is listed in this topic list: Waterways & Vessels.
Location. 60° 47.259′ N, 148° 52.726′ W. Marker is in Anchorage, Alaska. Marker is on Portage Glacier Road. The marker is located on the Williwaw Salmon Viewing Platform. Touch for map. Marker is in this post office area: Girdwood AK 99587, United States of America. Touch for directions.
Other nearby markers. At least 6 other markers are within 5 miles of this marker, measured as the crow flies. Atlantic Salmon-A Threat to the Chugach National Forest? (here, next to this marker); 1964 Earthquake (approx. 4.1 miles away); Moose Calves (approx. 4.2 miles away); Our Living National Symbol (approx. 4.3 miles away); A Prickly World (approx. 4.3 miles away); Brown Bears of AWCC (approx. 4.3 miles away).
Credits. This page was last revised on June 16, 2016. It was originally submitted on December 12, 2013, by Don Morfe of Baltimore, Maryland. This page has been viewed 465 times since then and 11 times this year. Photos: 1, 2, 3. submitted on December 12, 2013, by Don Morfe of Baltimore, Maryland. • Al Wolf was the editor who published this page.