I'm afraid I don't know anything about your fish question, but on your side note,
ps..on a side note walked along the north arm of the fraser and holy crap do power boats go by fast...one powerboat guy nearly toppled over a sailboat...crazy..
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I see that sort of inconsiderate power boat operation all the time, on the Fraser, Pitt, and any lake that you can operate power boats of larger size/displacement. I have often had such idiots pass very close (often less than 100ft.) while I have been fishing in my smaller boat (12ft. alum.) and even in my 16ft. 120hp runabout. The main causes of the problem appear to be a combination shear ignorance and the deep-v (large displacement) hull, often with operating the boat at a speed that generates the heaviest wake, slightly below the speed at which the hull reaches the correct planing speed (although with large displacement hulls there really isn't a speed where they don't create a large wake). When at plane my runabout (having a modified shallow-v) leaves a wake no more than 3-6 inches high, which very quickly dissipates and I always give smaller, and/or unpowered craft including sailboats, a wide berth, and when in a speed restriction zone I will throttle-down to the posted speed. With a sailboat under sail, they have the right-of-way over all craft, except when encountering a boat that is trolling or mooching, the power boat operator should have cut power significantly more than what is shown in the photo (probably to around 5-10 kph) and certainly sooner than when the picture was taken. Sort of gives another good reason for requiring people to have a Pleasure Craft Operator Card, hopefully the sailboater reported the other guy to the authorities. As for myself, I'm considering getting one of those rapid-fire paintball guns for these guys, it's just too bad the paint in the capsules isn't of a more permanent type.
Didn't mean to hijack your thread, but this is one of my pet peeves and I had to vent it.