Sea-Chervil

Alcyonidium diaphanum

Sea-chervil, known scientifically as Alcyonidium diaphanum, is a bryozoan species that resembles the herb chervil. It is typically found in the North Atlantic, thriving in a range of environments from the Northeast Atlantic to the Mediterranean Sea and the Arctic, with recorded occurrences from Ireland to France and as far northeast as the East Siberian Sea. This species is usually found at depths between 10 and 80 meters, predominantly in shallow waters where it can establish itself on various substrates. As a sessile organism, Sea-chervil remains fixed in one location, forming colonies that can be identified by their bushy, branching structures. While it may be mistaken for other bryozoans, its distinct appearance and habitat can help divers differentiate it from similar species. When handled for extended periods, Sea-chervil can cause a skin irritation known as 'Dogger Bank itch', which is an important consideration for divers. This species is hermaphroditic, meaning it possesses both male and female reproductive organs, allowing for internal or external fertilization and egg brooding. Encounters with Sea-chervil during dives can be intriguing, as divers may observe its colonies thriving in their natural habitat. Conservation status for this species is not evaluated, indicating a lack of comprehensive data on its population trends.