We saw a very dense bait ball off Sooke a few days back with the small Herring boiling right out of the water an inch or so in about a 5 foot circle and all twinkly and silver. We grabbed the bait net and as we got beside it they went down off the surface but we still filled up the net. They were a bit small for bait as most were three to four inches and rather flat compared to Anchovies so you would need very small hooks and teaser heads. There were a few that made it to 4.5 inches or so. We did not think using them for bait would be all that practical, at least the way we troll bait.
I guess you could rig the larger ones up for live mooching but keeping them alive would be an issue and I think all the small salmon shakers would be likely to hit them before you had a chance to hook up a big one at Sooke. We are just not rigged for that kind of fishing.
Englishman likes trolling with them and I understand has hooked up a few salmon on the little herring.