Marine science observation of the Nudibranch species Thordisa slowly moving along a soft coral sponge

scuba scuba diving diver snorkeling underwater great barrier reef tropical destination tropics zoo marine conservation marine park animal encounter fish pacific nature wildlife water activity ecosystem nudibranch creature sea slug gastropod animal behaviour colourful blue planet aquarium collector fish keeper artistic unique 4k resolution underwater light night diving sea creature flabellina mass gathering multiple research documentary lighting sponges behavior australia creative illuminated nocturnal observation velutinid thordisa crawling