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MARKER DATABASE
“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Anchorage in Anchorage Borough, Alaska — The American West (Northwest)
 

Coho Salmon Life Cycle

 
 
Coho Salmon Life Cycle Marker image. Click for full size.
By Don Morfe, September 11, 2009
1. Coho Salmon Life Cycle Marker
Inscription. 1 to 4 years in fresh water

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 are adapted for salt water.
—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
Coho Salmon in the stream image. Click for full size.
By Don Morfe, September 11, 2009
2. Coho Salmon in the stream
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.”
 
Location. 60° 47.259′ N, 148° 52.726′ W. Marker is in Anchorage, Alaska, in Anchorage Borough. Marker is on Portage Glacier Road. Click for map. The marker is located on the Williwaw Salmon Viewing Platform. Marker is in this post office area: Girdwood AK 99587, United States of America.
 
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).
 
Categories. Waterways & Vessels
 
An Alaskan Salmon Viewing Experience image. Click for full size.
By Don Morfe, September 11, 2009
3. An Alaskan Salmon Viewing Experience
The pristine watershed in the Chugach National Forest create an ideal home for wild salmon. Follow these simple rules to view the salmon in their natural habitat without disturbing them. They have worked hard to get here.
 
 
Credits. This page originally submitted on , by Don Morfe of Baltimore, Md 21234. This page has been viewed 362 times since then and 31 times this year. Photos:   1, 2, 3. submitted on , by Don Morfe of Baltimore, Md 21234. • Al Wolf was the editor who published this page. This page was last revised on June 16, 2016.
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