I'm glad to see some attention being paid to the plight of the dogfish. Years ago, back in the 80's, I think, Van Egan, while teaching at Campbell River High School, did some field studies on the ecology of dogfish and demonstrated their importance to the marine ecosytem. Since then, these long-lived and slow reproducing critters have received some attention, but obviously not enough. This little shark seems universally depised by marine anglers and commercial fishers all up an down the coast.
As an example, I went out on a charter from Ucluelet a few years back, when the waters off the west coast of Vancouver Island were teeming with Spanish mackerel. Every time a dogfish was hauled on board, the deckhands would pounce on it, stab it several times, and then punt it back into water, accompanied by much swearing and righteous indignation. The Spanish mackerel, on the other hand, received no such treatment, even though they pose a great threat to the native fisheries.
I hope posters are going up at marinas urging the careful handling and release of the surviving dogfish. What can be done about reducing the commercial by-catch is beyond me.