Herrmann's Sea Cucumber

Overview

Herrmann's sea cucumber, often referred to as curryfish, is a large, benthic echinoderm found throughout the tropical Indo-Pacific region. These slow-moving animals play a vital role in their ecosystems by sifting through seafloor sediments to consume organic matter.

Distribution & habitat

This species is widely distributed from the east coast of Africa across the Indo-Pacific to Australia, though it is absent from Hawaii. It typically inhabits calm, shallow waters such as lagoons, coastal reefs, and seagrass meadows. They are commonly found on sandy or muddy substrates and rubble, generally avoiding high-energy reef crests.

Appearance

Herrmann's sea cucumber has a cylindrical, somewhat trapezoidal body that can reach lengths of up to 50–90 cm. Its thick, wrinkled skin is highly variable in color, ranging from mustard-yellow and orange-brown to greenish-brown or grey. The body is covered in small, dark-colored papillae, with some larger, conical tubercles often circled by distinct markings. The mouth is surrounded by 10 to 16 feeding tentacles, and the flat underside features rows of tube feet used for movement.

Biology & behavior

These sea cucumbers are primarily solitary and benthic. They are known for their role in sediment turnover, effectively acting as "earthworms of the sea" by processing organic particles from the substrate. Reproduction involves external fertilization, where gametes are released into the water column; the resulting larvae drift for several weeks before settling on the seabed to develop into juveniles.