I got it on a 3/8 oz. "pot bellied jig". Which is a lead head, painted blue on
top, white underneath, big eye and about a 2" ultrahair or fishhair tail.
No worm.
Looks just like a sand eel.
I don't know where you could get them on the S. Cape from shore. I've
seen them around the pond inlets but they move so fast its hit or miss.
They seem to frequent Waquoit and Osterville from what I have seen.
I saw them 20' off jetties at east chop in 3' deep water, but thats the Vineyard.
I wouldn;'t want to stake my life on it, but that bar east of South Cape beach and the stoney beach past it are as likely a spot as any.
My bonito chasing/observing experience says they are civilized critters and show on the surface perhaps and hour past dawn, circling back and forth all morning till boat traffic puts them down. I also have a somewhat experienced feeling that they swoop around the pond entrances at the outgoing tide more than the incoming. However I have been told (but not seen) bonito do ride into Waquoit on the incoming tide and have been caught inside.