We went on an awesome night dive on our house reef!
We had planned to go the night before but thunderstorms meant it probably wasn’t the greatest idea, so we had our fingers crossed for the next night. Luckily it was flat calm seas and the stars were out.
It’s always super interesting to see a different side to the marine environment at night. All the creatures that are active in the day find a safe spot to sleep and hide from predators, while other critters come out to feed. The reef is so busy with fish during the day that it felt like a ghost town. The cardinalfish, squirrelfish and soldierfish which are normally lurking in coral in the day are out in the water column, their big eyes shining in the torchlight. We also saw a parrotfish sleeping, wrapped up in its mucus cocoon that it secretes around itself a bit like a sleeping bag, to stop predators sensing it. A really cool sight! You can learn more about this here.
It’s the time of the sea stars! The brittlestars, feather stars and basket stars travel to the top of the coral or substrate they were in during the day and waft their arms around to catch food particles in the water. We also saw a banded coral shrimp and a beautiful free-swimming flatworm (possibly Pseudobiceros flowerosi) which was as graceful as a ballerina.
Corals also look completely different at night, if you study them closely. All their tentacles extend to catch food, giving them a fuzzy-looking texture. The tentacles of one species in particular, Tubastrea , were extended a huge amount. Unlike most other corals, this type of coral doesn’t rely on symbiotic algae to provide food via photosynthesis, so needs to catch all its food in this way.
We go on roughly one night dive every month to give volunteers the chance to see the house reef in another dimension. It’s crazy how a well-known dive spot can completely transform into an alien world!
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