The migrations that make up the well-known salmon life cycle have long been described as one way at a time. Juvenile salmon hatch and swim down rivers to the ocean, where they grow and mature before ...

Early on a recent Wednesday morning, anglers in Anchorage lined Ship Creek and cast lines to catch returning chinook salmon. Just minutes after 6 a.m., shouts of “fish on!” fluttered across the shore.

When wild Atlantic salmon breed with escaped farmed salmon, their descendants grow faster and mature at a younger age, undermining the ability of the species to survive and reproduce in its natural ...