Noon was feeding time at Ngā Manu for the Longfin Eels:

The longfin eel is one of the largest eels in the world and it is found only in the rivers and lakes of New Zealand.

I was told these were males, probably about 20 years old. They were certainly keen to get lunch.

A mass of writhing eels, many with heads out of the water, and the foot of the keeper who came to feed them.
A mass of eels, a bucket and a foot; one eel is going into the bucket to feed.
A mass of eels, a bucket and a foot; one eel is on its back displaying its underside.