tuna catch

Hook live bait, like whiting or herring, through the nose. Place your bait at various depths to create an attractive setup, setting out the shallowest lines first and the deepest lines last so that the lines don't become tangled
.Toss the pieces off of the transom until you have a visible chum click. Toss in new pieces every minute or so to keep the chum slick constant.
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Watch your sounder. If you are finding fish at different depths than the depths at which you set your bait, then you may want to change your bait depth. A bluefin will be 20 to 30 feet (6 to 9 m) on your fish finder and will have a characteristic hump shaped like an upside-down "V."