I must admit to having only fished Lake Kaniere on two occasions. Both trips to the lake, were from Hokitika, and were of short duration, accompanied by my, then, young family. Each time I was without a boat. So I haven’t been able to give it a decent enough bash to be able to comment really! I’m sure that your prospects from a boat, either trolling or casting, would be much better as access around the shoreline is quite difficult. Looking today at my fishing guidebooks collection the authors don’t seem to recommend Lake Kaniere.