Mark Davis of BigWater Adventures is an accomplished saltwater fisherman. The first step to successful offshore fishing is catching live bait. If you’re fishing for yellowfin tuna, you need to know what they’re feeding on and how to locate and catch that bait. For bait fish like menhaden/pogies, you’ll need a cast net. For threadfin herring, use a sabiki rig, which is a multi-hook rig. First, learn how to throw a cast net. You’ll want a 12-14 foot, fast-sinking net. Look for schools of fish on top of the water or individual fish flicking on top of the water if the schools are deeper and cast your net there. To successfully catch tuna, know what bait they’re after and then go catch those bait fish.