Since mid-July, over a million chum salmon have migrated into the Yukon River from the Bering Sea during the fall season, according to Fisheries and Oceans Canada. Despite this surge, experts caution that this uptick does not necessarily indicate a positive trend in the species’ population.

In 2020, a significant decline in chum salmon numbers was observed, raising concerns among researchers. Sebastian Jones, a wildlife analyst at the Yukon Conservation Society, expressed unease over the lack of understanding regarding the fluctuations in salmon numbers, emphasizing the limited control over these ecosystems.

Canadian-origin salmon constitute about 12% of the returning fish population, a decrease from the typical range of 20-30%. While still below ideal levels, Jones noted an improvement compared to recent years, with the expectation of 100,000 chum salmon crossing the border this year, up from 25,000 in the previous year.

Stephanie Peacock, a scientist at the Pacific Salmon Foundation, highlighted the importance of chum salmon as a key nutrient source in the fall, emphasizing their delayed migration compared to chinook salmon. Both species have experienced declines over time, with chinook salmon showing a gradual decrease since the 1990s, and chum salmon facing a more rapid decline.

Researchers are investigating the Bering Sea, where the Yukon River meets the ocean, as the starting point for these salmon’s upstream journey. Changes in the enclosed ecosystem, such as rising water temperatures and increased industrial fishing, have raised concerns about their impact on the salmon population.

While cautiously optimistic about the recent numbers, Peacock stressed the need for continued vigilance due to the long-term decline in Yukon chum salmon populations. The situation calls for a comprehensive understanding of the challenges faced by these vital species.