Scientists debate whether Pacific Coast Feeding Group merits separate management status

Researchers at the symposium reviewed multiple lines of evidence about the Pacific Coast Feeding Group (PCFG), a subset of grey whales that forage along Pacific coastlines and often do not complete the full Arctic migration.

Jonathan Scordino (Maca Tribe marine mammal biologist) summarized photo-identification, genetic and mark–recapture results. He noted that photo-ID matches show both persistent site-fidelity individuals and some immigration: "on average there are 27 new non-calves observed each year and an average of 9.9 recruit into the PCFG," he said. Genetic studies find limited nuclear-DNA differentiation but mitochondria/haplotype differences consistent with maternal fidelity; simulation work suggests a small number (1–8) of immigrants per year best fits observed haplotype frequencies.

Panelists said management responses vary by jurisdiction: NOAA and the IWC do not currently designate PCFG as a separate stock, although some Canadian assessments have recommended recognizing the group for conservation planning. Speakers urged a formal reassessment of demographic independence because the PCFG shows distinct ecological dynamics (coastal prey, high residency and unique threats) that could warrant targeted management measures.