Mr Moore said there were "four or five of the critters" between 10 and 15m long.
"He was enjoying a leisurely swim down the beach towards his mates who were playing near Maketu."
Department of Conservation ranger Pete Huggins, said they have been monitoring reports of the animal since late last week, and that it has travelled from colder waters in the south.
"It is quite normal to see these animals close to the shore like this, as they follow traditional migration routes," said Mr Huggins.
