This video says about itself:
9 June 2012
HD video of scuba diving at Bunaken National Marine Park near Manado city at North of Sulawesi island in Indonesia. Fascinating walls covered with sponges, soft and hard corals, huge green turtles and tiny nudibranches, colorful anemones with clown fishes, eagle rays, morays etc.
September 18, 2017
Summary: The Indonesian coral reefs, located in the so-called coral triangle, are considered amongst the richest and most biodiverse places on Earth. Surprisingly, this impressive species diversity is still poorly known. Biologists now report the presence of 94 species of sponges, including six new to science and two new symbiotic sponge associations.
Comprising more than 17,000 islands, the Indonesian archipelago is one of the world’s most biodiverse places on Earth.
Sponges, aquatic organisms whose bodies consist of numerous pores to allow the ingress of water, are key components of this richness and play a fundamental role in the survival of coral reef habitats. Furthermore, they are also known for their medicinal benefits.
Unfortunately, due to the paucity of taxonomic expertise, the sponges from the Indonesian reefs are often ignored in monitoring surveys and conservation programmes, while their diversity is largely underestimated.
Researchers from the Italian Università Politecnica delle Marche and Università degli Studi di Genova, PharmaMar, Spain, and University of Sam Ratulangi, Indonesia, describe six new species in their paper in the open access journal, ZooKeys.
Inspired by their extraordinary biodiversity, the researchers teamed up with the pharmaceutical company PharmaMar to conduct several expeditions in the waters of North Sulawesi Island.
The authors reported a total of 94 demosponge species belonging to 33 families living in the North Sulawesi Island. Amongst them, there are six species new to science and two previously unknown symbiotic relationships.
Seven of the recorded species were collected for the very first time since their original description.
However, these findings are still scarce, given the abundance of the sponges in similar localities in the Indonesian archipelago.
In conclusion, the authors note that the marine diversity in Indonesia is still far from being well known.
“Thanks to this impressive diversity, these areas are important spots for diving tourism and require the urgent development of sustainable tourism practices”, they say.
A completely new group of sponges has been discovered, which scientists believe could be a key indicator species in measuring future mining impact in a region targeted for deep-sea mining of polymetallic (metal-rich) nodules. They are likely to be the most abundant nodule-dwelling animal in the area: here.
New deep-sea sponge could play a starring role in monitoring ocean health. Plenaster craigi grows on metal-filled rocks that are a target for mining, by Carolyn Gramling, 7:00am, October 10, 2017.