Rebound of some salmon stocks a mystery due to data gaps
A recent annual report from the Pacific Salmon Foundation (PSF) details which populations are rebounding, but gaps in data obscure why certain stocks are increasing or decreasing.
The PSF’s 2025 State of Salmon report categorizes salmon population averages by the spawner abundance and the total abundance. The spawner abundance is the number of mature salmon that return to their spawning grounds to reproduce after escaping. The total return abundance is the number of spawned and caught salmon that survive to maturity.
