Keishu Asada
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cephwarden.bsky.social
Keishu Asada
@cephwarden.bsky.social
A warden of Sand Quentin.

Videographer and photographer, mostly of marine wildlife. Marine Fieldwork Specialist at the Okinawa Institute of Science and Technology (OIST), Marine Science Section.
Okinawa had its hottest September at 1.6C above the average. I filmed this mass coral bleaching last year, but didn't have the heart to share. Total annihilation of the first few meters of depth. This stuff happens before our eyes, and yet people who think it isn't real keep gaining power.
October 2, 2025 at 10:24 AM
The footage quality is poor, but this is a rare Rhina ancylostoma, bowmouth guitarfish, seen in Oura Bay (Okinawa), where they are building a new US marine corps base. It's a type of ray. I've never seen one in the wild before!
September 8, 2025 at 10:52 PM
Rain and rainbow
September 4, 2025 at 10:54 PM
I was looking at the many orange sponges in area thinking 'it would be cool if one of these was a frogfish'. And one of them was.
June 22, 2025 at 11:08 PM
An Octopus cyanea - when you are at your most beautiful when you are barely visible at all
June 19, 2025 at 10:51 PM
A marbled stingray foraging at dusk, having come up from the deep as soon as the sun started to set
June 17, 2025 at 11:12 PM
A sea elephant (heteropod) flapping its lazy way through the night. Something about the motion of its fin is weird and hypnotic.
June 17, 2025 at 11:23 AM
A polychaete worm jives with a solitary dance number in the darkness
June 16, 2025 at 10:47 PM
Among a dreamlike seascape of copepods and jellies, a rare heteropod (sea elephant)! Despite looking like the ghost a of a vengeful banana, with beady eyes and a long proboscis, they are a type of pelagic snail. Fin on its belly is its 'foot'.
June 15, 2025 at 10:12 PM
A hypnotic flatworm flowing through the night
June 15, 2025 at 11:42 AM
Bobtail squid (Eumandya parva) in the darkness, looking like it's ready to start a tiny, tiny fight with someone
June 12, 2025 at 11:14 PM