When using bait on a jig try using a rubber band (dental braces rubber) to hold the bait on. When using bait below a float it can be rigged up like drift fishing or put in a small colored nylon bag. This works well when shrimp tails are the preferred bait. Bait bags can be made up of mixed ingredients for specific species... steelhead, salmon.
Use can of tuna packed in oil like you would roe. Place in bag and wrap. Claimed to work good for salmon
Bait bags can be made to float by adding small styrofoam balls.
They can also be added to a diver to add a scent trail to your bait.