But a cod can put up plenty of spirit if you give it chance. Savage Gear now produce a fantastic range of soft plastic sandeel that comes in weights heavy enough to jig on their own (i.e. ~100g), even in a fast drifting kayak.
If you want to see how to fish for cod using light tackle (standard spinning rod and fixed spool), jigging with single sandeel, then check out this nice video below from Savage Gear's Mads Grosell. He shows how fishing for cod in relatively shallow water with very light tackle is great sport. His experience is one that chimes with mine on the kayak. Fish a bit lighter, using braid and a single lure, and cod suddenly become a fish that fights harder than you might imagine. Mads uses pretty much the same set up I do: 30lb braid, with a 9.2kg Amnesia leader (you need this for abrasion resistance against sand-encrusted pot ropes and the like). Heavy duty snap and then your weighted soft plastic. The 100g sandeels from Savage Gear really look the business - but check out just how light Mads goes and still catches good sized cod: