Green Ormer

Overview

The Green Ormer (Haliotis tuberculata) is a distinctive marine gastropod mollusk, often referred to as the European abalone. It is highly valued as a culinary delicacy, which has historically influenced its population levels and led to the development of regional management and aquaculture efforts.

Appearance

This species is easily recognized by its flattened, oval, ear-shaped shell, which typically features a low spire and a series of small, raised holes along the margin. While 5 to 7 of these holes remain open to allow for water circulation and sensory tentacle extension, the others are sealed as the animal grows. The exterior of the shell is often mottled with greenish-brown to reddish hues, providing effective camouflage against rocky backgrounds, while the interior is lined with a shimmering, iridescent layer of mother-of-pearl. The animal itself possesses a large, muscular foot for strong adhesion and a head featuring two prominent blue eyes.

Distribution & habitat

The Green Ormer is found along the rocky shores of the northeastern Atlantic, ranging from the English Channel and the coast of Brittany down to the Mediterranean, the Azores, the Canary Islands, and as far south as Senegal. It prefers stable, rocky environments, frequently hiding in crevices, fissures, or beneath stones to remain sheltered from light and strong currents.

Feeding

As a generalist herbivore, the Green Ormer primarily grazes on various types of algae. It is commonly observed feeding on rocks covered with encrusting red algae and is known to consume drift algae, such as sea lettuce (Ulva spp.).

Reproduction

This species reproduces during the summer months through external fertilization, releasing gametes into the water column.