go to a rock pool with fish in it...even small ones.
then give them a piece of squid to eat.
you will see that they tend to grab the squid and swim away and the other will follow.
if it is small enough then the competition will not get any to eat.
this also applies in the real world of fishing.
so basically, bait needs to be small enough to allow fish to get bait and hook inside its mouth.
so in essence they should be hooking them selves.
what it also tells me... "your missing 7 of 10" is that smaller fish could also be present or bait, hook size is too big.
circles, does not work for me. sorry the target specie is too small.
because you need bait dangling from circle hook.
thus fish needs to swallow bait and hook to get a hook up.
but each to their own, I guess.