Chum is the term used for Attractor Bait in Saltwater - it consists of Chopped Sardines, Anchovies or other Fish Offal. Angling ethics forbid the use of animal products. Chum is used to attract fish into the Target area . In Australia it is called Berley. Another local name for it is "Lok".
There are a several techniques for using it.
Minced Chum in a Citrus Bag is placed where a Rip (current) goes out to Sea placed just where the waves can lap at it. This will create a slick .