Its now at: http://seattlepi.nwsource.com/local/139559_tl115.html

The discussion in the paper is talking about pollutants from development. And they bring up the that the problem is with algae blooms dying.

This is a common problem in the Puget sound region, as typically lakes are phosphorous poor, and development brings in plenty in the form of silt. The incoming phosphorous brings larger blooms of algae that die when the light levels drop off. The decomposition of the algae uses oxygen at depth and causes for oxygen stress in the creatures that need it, rockfish, octopus and the like.

As to the shrimp season, I cannot say, but isn't shrimping confined to the norther part of the canal? The 02 problem only exists in Dabob Bay and points south.