How do you know it’s November in Cowichan Bay? You can hear and smell the male Steller sea lions (Eumetopias jubatus). These big boys visit Cowichan Bay every November to feast on the salmon returning to the Cowichan and Koksilah Rivers on their way to the spawning grounds. Weighing up to 800 kg, male Steller sea lions are so big that one or two of them can sink a small sailboat, as some locals have recently learned the hard way. Steller sea lions are quite gregarious and communicate with loud roars and deep growls. These sea lions are shallow divers and can hold their breath for approximately 16 minutes underwater. California sea lions (Zalophus californianus) also visit Cowichan Bay to feast on salmon in November. California sea lions are smaller and darker in colour compared to Steller sea lions, and mature males have a bump on their forehead called a sagittal crest. Check back on our website in the fall for more videos and sound clips of sea lions!
However, what’s good news for seals and sea lions is not such good news for the rivers’ salmon runs as increasing drought conditions in our watersheds can leave large numbers of salmon waiting in the estuary for increased river flows in order to migrate up-stream, and getting eaten by seals and sea lions as they wait.
Caption: Listen to California sea lions barking underwater. The sound was recorded using a hydrophone (an underwater microphone) near Denman Island during the wee hours (~2am) of March 11, 2020.
Audio Credit: Philina English, Fisheries and Oceans Canada
- Read Times Colonist’s article on sea lions throwing a bachelor party at Cowichan Bay.
- Read more facts about Steller and California sea lions from the University of British Columbia’s Marine Mammal Research Unit.
- Watch videos of sea lions at Race Rocks Ecological Reserve on the southern tip of Vancouver Island.
- Watch a video of sea lion research using GoPros from the Vancouver Aquarium.
- Watch Marine Detective’s video of Steller and California sea lions barking underwater.
- Read a Fisheries and Oceans Canada report on the status of Steller sea lions in Canada.
- Read the Globe and Mail’s article about the proposed BC seal and sea lion hunt.