A commentary by a biologist with the nonprofit Wild Fish Conservancy in Duvall, Washington, who has led research of river-based, sustainable salmon harvesting methods throughout British Columbia, Washington, and Oregon.
“Increased abundance and quality of prey within southern resident killer whale critical habitat can be realized by changing fishing practices,” said the authors. After salmon hatch in their home rivers across the West Coast, the vast majority migrate to marine waters offshore of southeast Alaska for foraging. Salmon of various species, populations, ages, and sexes comingle in this ocean nursery.
While wild salmon abundance and diversity declines from mixed-stock harvesting, so too does the age and size-structure of these populations. Since the 1920s, the average chinook has shrunk by about 50 per cent.
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