Went for a fish to the Kaniwhaniwha, a tributary of the Waipa and runs off Pirongia.
The very thing I first saw as I looked in the river was a really big fish and as it moved closer saw it was a Koi Carp! Now this was in fairly fast flowing, shingle bed - not the sort of place I'd have expected to see one. I entered the stream and soon saw a decent rainbow about 4 lb. I cast my cicada pattern ahead of it and saw the trout move towards it. Next second another Koi swam downstream towards my fly and the rainbow made a hasty departure!
I was trying to watch both fish and pulled in my fly which was well downstream then the koi took it. Now I'm only fishing with a 4X leader and this was a big fish and it soon headed off downstream and broke me off!
As I moved upstream I saw another trout and a koi appeared and looked spooked. Same thing happened another couple of times. The Koi were all in fast flowing water and for every trout I saw there were 3 times the number of Koi.
This is a bit of a worry so I'll talk to the F&G manager next week.
I never expected to see koi in obviously trout waters??