Hook Size?

Last post generated some v. interesting debate. Felt that I learnt loads.
Have stuck with the carp tackle, got some decent lures and floats and
although not immediately successful I am hopeful. Have found a spot under
some cliffs with a good forty to fifty feet of water under the rod tip.
I want to fish mackerel strip but feel that my size 6 o'shaugnessy hooks are
a bit on the wee side. Also, I now know that dogfish are considered a
nuisance in many places, but I am interested in catching a few for the
plate.Do they fall to float fished or bottom baits? What depths of water /
types of terrain are they found in?Any advice/guidance?

Cheers,
Angus,
Applecross