softbaiting is arguably the most effective.

you need favourable conditions and to be on top of your game. Fish opposite the cages and make sure your casts are landing within a meter or so of the pens. This requires good gear and technique to achieve

and is not possible with weights under 1/4oz so decent flow is required to fish here effectively. Minnow style baits worked with plenty of subtle twitches are the way to go in this situation.

you need favourable conditions and to be on top of your game. Fish opposite the cages and make sure your casts are landing within a meter or so of the pens. This requires good gear and technique to achieve

and is not possible with weights under 1/4oz so decent flow is required to fish here effectively. Minnow style baits worked with plenty of subtle twitches are the way to go in this situation.