When fishing for live bait, there are many signs that will put you on the bait. A good captain can read the water and/or a depthfinder to put the angler on the bait.
Circulating and diving birds are usually sure giveaways that bait is near. You can position your bait on the outskirts of the diving birds and proceed to cast sabiki rigs or get close enough to throw a cast net.
Depending on the type of bait you are targeting will determine the size of hooks or mesh size of your cast net. For these reasons, you want to have multiple options on board your boat. Sabiki sizes 4 through 10 should cover you for most live baits. Cast nets form