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Size 6 hooks are what you want, (but 8's will do the job).
When I was a boy we would catch them behind my house in Fla on the ICW.
They are a bit tough to catch because they tend to "mouth" the bait, (in this case a bread dough ball), forever!
Mouthing the bait??- they will take your cork under numerous times and you never REALLY know when to strike. (However, this can make for some exciting fishing!) They tend to drop the bait in a split second if they feel any type of "bad vibe"!
Thats why many Mullet fishermen use a "Cane Pole" out-fit. A 12-13 Ft heavy canepole ,(NOT one of those cheapy, skinny cane-poles, from Walmart), very small cork and size 6 hook. Pro Mullet guys will wait til the cork goes under, and then SLOWLY raise their canes til they "feel" weight on the line; then STRIKE!
Anyway-The KEY to Mullet fishing is chumming them enough to get them into a "feeding frenzy".
Me and my friends would go through (at least) a loaf of bread and a box of bread meal in an afternoon.
If you see a school coming through toss some bread on the surface. That will get them going.
Try it!
It works!
And when you get tired of fooling around with them, with ONE good cast from a cast-net you can catch the whole SCHOOL! (lol)