The E-Rotary Bait Holder is deadly for salmon.  It is offered in two models - the E-Rotary and the Big Fin.  The E Rotary is for 4 to 4.5 inch anchovies, herring or other baitfish.   The top two items in the photo show this item.  The bottom two items are the Big Fin baitholder which is for 6 to 7 inch bait.  These baitholders come with the Pro-Troll Electronic EChip which attracts salmon with tiny electric nerve pulses.  The diagonal fin on the back causes the bait to roll with an erratic action.  This lure comes with a 5/0 stainless barbed hook.