Thanks Stella. That group of kids has me in it too I am the one at the left.
To me the fish in 3 and 4 looked like the same species, at the time we were observing them, so we will go with banded kokopu.
We also thought the pair were most likely inanga.
We had such great fun and plan to go again in April as a fish expert from DOC will be available then (she is currently in Antarctica) to take us on a guided trip. I am sure all who went this time will be willing to go again (just about had to drag some of them away as it was) and a good opportunity for those who missed the first outing.
As well has hunting out native fish, it was low tide so we were able to get around to the rockpools and have a poke around in them, then we searched the nearby caves for dragons and vampire bats (great disappointment when we found neither).