Originally Posted by Dan Worth
To that end, the observer had been asked if the "Whales" had large dorsals...but she had said not (not conclusive, but would expect dorsals to 'feature' in a Rissos sighting).
..water spouting was probably a red herring.
Dorsal fins on Risso's are pretty obvious.
They do, when working hard (either swimming or playing), spout to at least some degree - not a large column like, say, a humpback whale; but you will get a definite cloud of spray and vapor a few feet above the animal.