There were so many that in places there were over a dozen per square foot. Most amazingly they were found at all depths, from the edge of the water all the way down to 55 feet.
a rather nicely colored one
![Image](https://photos.smugmug.com/Underwater-Photography/Marine-Life-of-the-Pacific/Nudibranchs/Opalescent-Nudibranch/i-GP3VsTg/0/L/_DSC2187-L.jpg)
chomping on the hydroids
![Image](https://photos.smugmug.com/Underwater-Photography/Marine-Life-of-the-Pacific/Nudibranchs/Opalescent-Nudibranch/i-8gjZQTG/0/L/_DSC2271-L.jpg)
a large group of a dozen or more feeding on a jelly that had somehow been ensnared
![Image](https://photos.smugmug.com/Underwater-Photography/Marine-Life-of-the-Pacific/Nudibranchs/Opalescent-Nudibranch/i-FcPrvJV/0/L/_DSC2305-L.jpg)
color variations occur because of variations in their diet.
![Image](https://photos.smugmug.com/Underwater-Photography/Marine-Life-of-the-Pacific/Nudibranchs/Opalescent-Nudibranch/i-xhDvjd7/0/L/_DSC2166-L.jpg)
Dan