Lifecycle of the Salmon

One of the Fraser River’s most notable inhabitants are the salmon that migrate up and down its waters each year. All five species of North American Pacific salmon can be found in the Fraser—sockeye, coho, chum, Chinook, and pink. While each species has variations in their life span, maturity rate, and time spent in streams and ocean, their general lifecycle remains the same.

Click through the interactive below to explore the lifecycle of Pacific salmon.

Ocean Adults
Adult salmon spend their lives in the open waters of the Pacific Ocean. It is during this phase of their life that they reach full-size, continuing to feed upon zooplankton, as well as crab, shrimp, and smaller fish like herring or mackerel. Their main predators are orcas, large fish, and seals. Salmon are anadromous, meaning they return upriver to their place of birth in order to breed after spending a portion of their lives in the ocean. The amount of time spent in the ocean before migrating back to their natal stream varies between one and seven years, depending upon the species. When it becomes time to migrate, salmon will gather in large schools and begin their challenging journey upstream.
Migrating Adults
Salmon undergo a unique transformation as they begin their migration journey – they will develop secondary sex characteristics, including a change in colouration and hooked jaws with sharp teeth. Some species even develop a hump on their backs! These traits can be particularly pronounced in males. During this time, salmon can travel 50 km daily as they make their return to their natal stream, relying on pheromones—unique, chemical signatures that they can smell— to guide the way. Salmon do not stop to eat during this journey - they are solely focused on reproduction and will forego food for up to six months as they migrate! As they travel upstream, these resilient animals can leap up to two meters out of the water to clear fallen trees, man-made obstructions, and even waterfalls.
Spawners
Upon returning to their natal stream, the female salmon will use her fins and tail to dig redds, where she will release thousands of eggs to be fertilized by male salmon’s sperm. Most spawners die after reproduction, completing the circle of life. Their bodies break down into nutrients that provide important sources of energy for other organisms, as well as the vegetation in and around their natal streams. The body of a single spawner can feed thousands of insect larvae, which then become a source of food for salmon fry.
Eggs
Each fall, in freshwater streams and creeks, female salmon lay their eggs in gravel nests called redds. Male salmon then swim over top of the nests to fertilize the eggs. These fragile, fertilized salmon eggs are then covered by females to provide protection from predators, where they will develop over chilly fall and winter months. Even with the protection of the gravel nests, only one in ten salmon eggs will survive the winter. Come spring, the surviving eggs will hatch as alevins.
Alevin
Alevins are newly hatched salmon—they emerge wiggling from their eggs, tiny and helpless against predators, with a yolk sack still attached to their bodies. This yolk sack acts as a food source for the first 30 to 50 days of life, allowing the alevin to remain hidden within the gravel nests. When this food source dries up, alevins begin the next stage of their life as fry.
Fry
Still small and vulnerable to predation, salmon fry continue to develop in the freshwater streams and creeks in which they were born—known as their natal streams. One of the very first acts of salmon fry is to swim to the surface of their stream and gulp a mouthful of air, which will go into a swim bladder that regulates their buoyancy. From there, salmon fry begin drifting downstream, venturing out to find food in the form of insects, insect larvae, fish eggs, and fish carcasses. They begin developing dark stripes along their bodies, which allow for better camouflage as they dart in and out of dusky stream beds. Almost 90 percent of salmon fry do not survive, due to predation, disease, or lack of food. Those who are able to beat the odds will imprint their natal stream’s unique scent before beginning their journey to the ocean.
Smolts
Fry become smolts as they enter the estuary. Along the way, smolts gradually adjust to saltier water in preparation for their journey to the ocean. They continue to grow, feasting upon zooplankton, insects, and other small invertebrates that are prevalent throughout the estuary, while doing their best to avoid predators such as herons, seals, and larger fish. At this stage, they develop silvery scales which will help them camouflage in the bright, open waters of the ocean.
Golden Paw
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Teacher’s Guide

Teacher’s Guide – Salmon Fry (best suited for elementary school students)

Teacher’s Guide – Salmon (best suited for high school students & older)

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Resources

Additional Resources – Salmon Fry (best suited for elementary school students)

Additional Resources – Salmon (best suited for high school students and older)

Keep learning about Watershed CPR with this resource from the Fraser River Discovery Centre: My River, My Home

About

The Watershed CPR Education Program is a self-guided, virtual learning experience all about the Fraser River, created by the Rivershed Society of BC.

In this virtual experience, users are introduced to the three pillars of Watershed CPR—Connect, Protect, and Restore—through a series of engaging activities and interactives about the Fraser Watershed. Users will learn about the flora and fauna that inhabit the Fraser; the First Nations who have lived in this area since time immemorial; some of the conservation issues affecting the watershed; and how to “perform Watershed CPR” and become a Watershed Defender.

To learn more about Watershed CPR and the Rivershed Society of BC, visit rivershed.com.

 

Thank you to our partners in development: Cicada Creative and Canadian Geographic, and immense gratitude to the Kwantlen First Nation for their time and contributions to the program. Consultation from Raincoast Conservation Foundation. Funding provided by the Pacific Salmon Foundation, and Environment and Climate Change Canada, via the Environmental Damages Fund.

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