Sasankovec Štíhlý

Overview

Commonly known as yellow polyps, these colonial cnidarians are a popular fixture in the marine aquarium hobby. While frequently referred to as Parazoanthus gracilis, this name is often considered a placeholder for an informally described species, as the true taxonomic status of these organisms remains a subject of ongoing study.

Appearance

These polyps are highly distinctive due to their vibrant golden to greenish-yellow coloration. They feature long, slender stalks and elongated tentacles that give them a delicate, graceful appearance. Individual polyps typically grow in colonies, encrusting various surfaces such as rock, sponges, gorgonians, and hydroids.

Distribution & habitat

This species is native to the Indo-West Pacific region. In the wild, they are typically found in shallow reef environments where they receive moderate water movement and light. They are known for their ability to colonize a wide variety of substrates, sometimes spreading over other corals or living organisms.

Biology & behavior

Yellow polyps are generally considered hardy and can grow rapidly under suitable conditions. While they are often kept in reef aquariums, they can be semi-aggressive; as a colony expands, it may overgrow and potentially harm neighboring corals. Conversely, they can be sensitive to the stings of more aggressive coral species. They do not typically require targeted hand-feeding, as they can often thrive through light-dependent processes and the capture of fine planktonic food from the water column.