You can see pretty much everything in Castle Rock, there is a huge variety of fish species, and not only that, as the current is generally much stronger at the surface than in the deeper waters, you will see a splendid macro life as well. All this is very enjoyable thanks to the great visibility, caused by its currents and for being in open water. The fauna of Castle Rock is very characteristic of Komodo National Park and Indonesia: rich, dense and diverse... and always in motion.
Some of the wonders that Castle Rock has to offer, once descending along the pinnacle, are the encounters with manta rays, reef sharks, eagle rays, schools of tuna and barracudas, giant trevallies, groupers, giant jacks attracted by huge schools of fusilier and surgeon, a variety of multi-colored wrasses, batfish, banner fishes, Spanish mackerels, unicorn fish all drifting with the current. You will meet other exceptional visitors, such as grey reef sharks, white tip and black tip sharks, wandering around, maybe looking for a good meal. And if you dive early in the morning, you may even see dolphins coming to play, which would add a high note to this already remarkable dive.