Kokanee Salmon Run in Mission Creek
One of the things I love about living in Kelowna is discovering that ordinary-looking places can hide extraordinary natural stories. During my walk along Mission Creek, I came across one of the Okanagan Valley’s most fascinating seasonal events the return of the kokanee salmon. As I looked into the clear, shallow water, I could see flashes of red moving through the creek. These were not ocean-going salmon returning from the Pacific; kokanee are a landlocked form of sockeye salmon that spend their entire lives in freshwater. Every year, they make their way from Okanagan Lake into Mission Creek to complete the final stage of their life cycle. Seeing them in person made the creek feel completely different to me, almost as if I had stumbled upon a hidden seasonal world. The Syilx (Okanagan) and Sinixt are Indigenous peoples of the Interior Pacific Northwest, and their languages and traditions connect kokanee with the “red fish,” referring to its bright red spawning colour.
The life of a kokanee is an incredible journey. They begin their lives as eggs laid among gravel in freshwater streams. After hatching and growing, young kokanee eventually move into Okanagan Lake, where they spend several years feeding and growing. Then, when they reach maturity, something remarkable happens the fish instinctively begin travelling back toward the streams. During the spawning season, their appearance changes dramatically. Their bodies become bright red, while their heads take on a greenish colour, and males develop a more pronounced jaw. Watching them move through Mission Creek made me think about how powerful instinct can be. These fish spend most of their lives in the lake, yet somehow they know when and where to return to continue a cycle that has been repeated for generations.
Photo credit-a-z-animals.com
The most fascinating part of the kokanee’s journey is the spawning process. When the fish reach maturity, they swim upstream against the current, using their powerful bodies to return to suitable spawning grounds. The female searches for a gravel bed where the water is clean and well oxygenated, then uses her tail to rapidly fan the gravel and create a shallow depression called a redd. She releases hundreds to thousands of eggs into the redd while one or more males release milt over them, allowing the eggs to become fertilized externally. The female then uses her tail to move gravel over the eggs, helping protect them from predators and keeping them in flowing, oxygen-rich water. The buried eggs develop over the winter, eventually hatching into tiny alevins, which remain hidden among the gravel while they absorb their yolk sacs. Once the yolk is nearly gone, they emerge as fry and begin moving into the stream, continuing the remarkable life cycle of the kokanee. I saw a lot of dead salmon as after spawning they get exhausted along their journey upstream which uses most of their energy, and their bodies naturally deteriorate after reproduction.
Photo credit-creation.com
Mission Creek itself is an important part of this story. The creek provides the flowing freshwater and gravel habitat that kokanee need for spawning, while its surrounding vegetation creates a larger riparian ecosystem. Mission Creek is connected to Okanagan Lake and, beyond it, to the wider Okanagan Valley. Parts of Mission Creek have been modified to improve habitat for kokanee salmon. A specially designed spawning channel, about 900 metres long, provides gravel beds and controlled water flow where salmon can lay their eggs. Small rock-and-log weirs and artificial riffles help create suitable water depth and oxygen-rich currents. Other parts of the creek were historically altered with dykes and channelization for flood control, so restoration projects now work to improve natural fish habitat. As I walked beside the creek, I realized that what looks like a simple stream is actually a biological highway connecting the lake, land and forest.
But the kokanee are not alone in this seasonal drama. Their arrival brings food and energy into the ecosystem and attracts attention from many other animals. One of the most iconic animals associated with salmon runs is the black bear. Bears can take advantage of salmon when the fish become concentrated in streams, gaining an important seasonal food source. The connection does not end when the fish die after spawning. Their bodies return nutrients to the surrounding environment, becoming food for scavengers and eventually contributing nutrients to the soil and aquatic ecosystem. Birds, insects, mammals, microorganisms and plants can all become part of this enormous food web.
Walking along Mission Creek and watching the kokanee made me appreciate the Okanagan in a completely different way. The bright red fish were only one visible part of something much larger a yearly cycle of life, death and renewal. For me, that is what makes exploring nature so special. You can walk the same trail many times and still discover something new when the season changes. At Mission Creek, the kokanee reminded me that beneath the peaceful surface of the Okanagan Valley, there is always a much bigger story taking place.
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