There were a couple tanks of Paua being grown for seeding back into the wild:
A dude was patiently sifting through them one by one to pull out the dead'uns. Epic effort.
We found a seahorse in amongst the kelp. (Kina feed on the kelp, and 'feeding them' involves fishing kelp out of the harbour with a large hoop on a very long pole & dumping it in their tanks).
I grabbed a vid of the kina waving about in the empty tank, they're pretty freaking cool little beasties. I tagged along a couple times and it always seems to be in good weather, strange that.