Holothuria fuscogilva

Holothuria fuscogilva, known as the white teatfish, is a large sea cucumber belonging to the family Holothuriidae. It has a thick, firm body wall, typically pale grey to white on the dorsal surface with darker mottling, and can reach substantial size compared to related species. As a deposit feeder, it moves slowly across the seafloor ingesting sediment and organic detritus, playing an important role in nutrient cycling and the aeration of substrate within reef ecosystems.

Like other holothurians, it has few natural predators as an adult but is vulnerable during early life stages.

The species inhabits shallow marine neritic waters, particularly sandy and rubble areas associated with coral reefs and lagoons. Its range spans the Indo-Pacific region, with recorded populations in Australia, Japan, China, India, Egypt, and South Africa, reflecting a broad but patchy distribution tied to suitable reef habitat.

Holothuria fuscogilva is heavily targeted in the commercial trade for dried sea cucumber (bêche-de-mer), particularly valued in Asian markets, leading to significant population declines in many areas through overharvesting. Additional pressures include coral reef degradation, coastal development, sedimentation, pollution, and the broader effects of climate change on reef habitats, all of which reduce the quality and extent of suitable habitat.

Conservation measures include harvest regulations, size limits, seasonal closures, and trade monitoring under international frameworks, alongside marine protected areas established in parts of its range. Some countries have implemented moratoria or quotas specifically targeting sea cucumber fisheries.

Despite these measures, enforcement remains inconsistent across its range, and illegal and unregulated harvesting continues in many areas. The population trend is currently decreasing, and without stronger enforcement and sustained international cooperation, continued decline is likely.

Holothuria fuscogilva inhabits shallow tropical coral reefs and sandy lagoons throughout the Indo-Pacific region, typically found at depths of 1-20 meters. The species prefers areas with mixed coral and sand substrates, often sheltering under coral overhangs or in crevices during daylight hours.