Biemna fistulosa

Biemna fistulosa is a sponge belonging to the family Biemnidae and order Biemnida. This species is found in tropical regions of the Pacific Ocean, specifically around Hong Kong, Indonesia, and Hawaii. It is a sessile organism, meaning it remains fixed in one place on the ocean floor. Biemna fistulosa is part of the class Demospongiae, which are known for their hermaphroditic nature. The life cycle begins with the development of a zygote into a free-swimming parenchymella larva, which eventually settles on a substrate to grow into a mature sponge. Divers may encounter this species at various dive sites near DiveSight locations. According to depth records, 48% of occurrences are shallower than 40 meters, and 90% are shallower than about 50 meters. This sponge does not pose any threat to humans and is considered harmless. Its conservation status has not been evaluated by the IUCN, CITES, or CMS. Encounters with Biemna fistulosa during dives are likely to be serene, as it is a non-mobile species. Its presence contributes to the biodiversity of the sponge communities in tropical marine ecosystems.