Salish Sea Currents magazine

Large plumes of methane bubbles have been discovered throughout the waters of Puget Sound prompting questions about the Puget Sound food web, studies of earthquake faults and climate-change research.

Over the past year, the Washington Department of Fish and Wildlife has reported an unusually high number of sixgill sharks found washed up along Puget Sound's shoreline. Four dead sharks in all were spotted, alarming scientists who believe that the large predators use Puget Sound as a pupping ground. Sixgills are rarely seen in Puget Sound but are one of its largest fishes, reaching lengths of up to 16 feet. Some speculate that warmer-than-usual waters could be a factor in the deaths, but the cause remains a mystery. We spoke with Fish and Wildlife biologist Lisa Hillier.

Fishing for rockfish was once promoted as a sustainable alternative to salmon harvests, but when rockfish numbers plummeted, fisheries managers realized they had a problem. Now a rockfish recovery plan seeks to reverse the damage as scientists learn more about protecting this once-popular game fish.

How can Puget Sound generate more salmon? That question has been at the center of ecosystem recovery efforts for decades. But even as scientists and conservationists make progress on many fronts — from breaching dams to cleaning up the water — they have faced one especially complicated and frustrating limitation: Salmon need more estuaries. We look at how local tribes are working to restore this critical habitat.

Scientists think they may have discovered a lost population of native kokanee salmon in Lake Washington. Salmon watchers are monitoring local creeks this fall to confirm the finding.

Bug seeding involves moving beneficial insects and other aquatic invertebrates from healthy streams to streams where these creatures are missing from the food web.