I have zero fly fishing experience but curious how do you go using fly gear for Ludrick as in there is no casting required and you traditionally fish at a set predetermined depth?
4-6 weight trout fly rod with a weight forward floating line.
9 foot leader coming down to a 4-8lb tippet (4 lb is risky, but more hookups.....and bustoffs).
Two weed flies tied to leader tippet, top one with a green glass bead for weight to get it down, an unweighted one tied off the bend of the top one.
NZ Strike Indicator system (check it on Google) for a float (basically a bunch of coloured wool type stuff). Can vary the depth in an instant with this system.
A little casting is required, sometimes just flick it out a few metres, but sometimes you might need a cast of up to 20 metres, or aim in front of a cruising luderick.