Trimma hollemani

Trimma hollemani is a small reef fish found in the Western Pacific, specifically in the waters around the Philippines, Malaysia, Indonesia, Australia, and Papua New Guinea. This species inhabits marine environments, typically residing in caves on reef slopes, often with overhangs and crevices. Divers can encounter them at depths ranging from 8 to 70 meters. They are associated with habitats that include sand, rubble, gorgonians, corals, sea whips, and sponges. The fish has an elongated, oval body shape, reaching a maximum length of 2.8 cm. The coloration of Trimma hollemani is notable, with a red to yellow background and a light stripe along the mid-lateral body. In life, these stripes appear blue, with a narrow red stripe below the eye. The fish has a distinctive dark caudal blotch. They have specific morphological features such as 7 dorsal spines, 7-8 dorsal soft rays, and a single anal spine. Trimma hollemani is classified as Least Concern on the IUCN Red List. Divers may find these fish in small numbers, often in cryptic settings within their habitat. They pose no threat to humans and are not of interest to fisheries.