Here's a NOAA link that addresses four basins off Hood Canal.
My point is these populations are all suffering from many different environmental issues, over harvest isn't one of them, or none of these agencies are saying it is. They also are not saying predators are a factor, so that's two primary tools in sport anglers tool box that are scientifically false.

http://www.nwfsc.noaa.gov/research/divisions/cbd/mathbio/isemp/docs/imw_progress_rpt.pdf


Hood Canal
Land use in the four watersheds in this complex range from urban and residential in Little Anderson Creek to almost entirely forestry in Stavis Creek. We plan to implement restoration treatments in all the watersheds except Stavis Creek. The types of treatments
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applied will vary by watershed depending on the factors perceived to be limiting fish production. In Little Anderson Creek, lack of wood and off-channel habitat has been identified as likely factors constraining fish production. We are currently planning several restoration projects that will address these concerns. Seabeck Creek displays evidence of channel incision in some locations and significant amounts of sediment deposition in other channel segments. The incision in this watershed may actually be contributing to low summer flows by reducing groundwater storage. We are currently conducting a hydrologic assessment of this watershed to determine the potential for increasing summer flow by reducing incision in key reaches. Big Beef Creek has a small impoundment that impacts water temperature downstream and provides habitat for various warm water fishes that may prey on coho and steelhead smolts. As the factors most likely to be limiting fish production become evident, appropriate restoration actions will be applied and the fish response compared with Stavis Creek, where no restoration applications will be applied.
The watersheds in this complex offer us the best opportunity to evaluate the impact of urban and residential development on our ability to increase salmon production with restoration efforts. These watersheds also offer the advantage of being quite small making it possible to treat a significant proportion of the channel network relatively easily.


Here's a paper done by AFS pointing to out migration problems in the Sound.




The depressed status of Puget Sound populations of steelhead Oncorhynchus mykiss contrasts with the healthier condition of those along the coast of Washington and suggests that there is substantial smolt mortality during the migration through Puget Sound to the Pacific Ocean. Acoustic telemetry transmitters and stationary receivers were used to investigate the survival, migration timing, and migratory behavior of 159 steelhead smolts in 2006 and 187 smolts in 2007 from four Hood Canal (part of Puget Sound) streams and one stream flowing into the Strait of Juan de Fuca. The estimated population-specific survival rates for wild and hatchery smolts from the river mouths to the northern end of Hood Canal (28.1–75.4 km) ranged from 55% to 86% in 2006 and from 62% to 84% in 2007. Survival was much lower from the northern end of Hood Canal to the Strait of Juan de Fuca (135 km) in 2006 (23–49%) and could not be reliably measured in 2007. Travel rates through Hood Canal (8–10 km/d) were significantly lower than those estimated as the fish migrated through northern Puget Sound and the Strait of Juan de Fuca (26–28 km/d), while the mortality rates per unit of distance traveled were very similar in the two segments. The high daily mortality rates estimated during the early marine phase of the steelhead life cycle (2.7%/d) suggest that mortality rates decrease substantially after steelhead enter the Pacific Ocean.

Received: January 23, 2009; Accepted: July 12, 2009; Published Online: October 22, 2009