Perhaps the most logical solution is more structure for the fish to hide! There has been huge advances in hatchery technology, many spawning areas have been rebuilt, and there has been several attempts to study and improve adult survival! However, from the time they reach the estuary til they get larger they are on their own.
It has been proven time and again that the mouths of the local rivers were packed with logs and debris year round. Has anyone been down seen the mouths of many of the local rivers at low tide? A tire counts as structure! Now, obviously we will never see the estuaries packed with debris again because of boating concerns and other things but we could begin installing structures along many river entrances. It wouldn't be hard, even modified play ground equipment such as the wire domes or climbing cones placed out side of clearly marked shipping lanes (but still submerged) would make a huge difference. Also, expanding the eel grass replanting program and increasing the number of secured steel and natural logs to prevent over consumption by geese and such would make a huge difference. Many are already working on this but they need support! I don't believe the that the problems are complicated , nor are the the solutions. Seals are a natural part of the system, but the system only works as a whole!