Atlantic Sea Nettle

Overview

The Atlantic sea nettle (Chrysaora quinquecirrha) is a well-known jellyfish species native to the Atlantic coast of the United States. Often found in coastal waters, bays, and estuaries, this species is recognized for its seasonal blooms that can occasionally lead to beach closures due to its painful sting.

Appearance

This jellyfish features a saucer-shaped, scalloped bell that is typically pale, ranging from white to pinkish or yellowish, often marked with deeper-colored radiating stripes near the margin. It possesses four long, ribbon-like oral arms extending from the center and numerous thin, trailing tentacles along the bell's rim. These tentacles are heavily armed with nematocysts, which are specialized stinging organelles used for defense and capturing prey.

Distribution & Habitat

While historically reported across various oceans, the Atlantic sea nettle is primarily associated with the U.S. East Coast, ranging from southern New England down to the Caribbean and Brazil. It thrives in a variety of marine environments, including high-salinity open ocean waters as well as the brackish conditions of estuaries and bays.

Feeding & Biology

As a carnivorous predator, the Atlantic sea nettle feeds on a diverse diet of zooplankton, small crustaceans, and other jellies, such as comb jellies (ctenophores). Its life cycle is complex, alternating between a stationary polyp stage attached to hard substrates and the free-swimming medusa form. During the polyp stage, it can reproduce asexually by budding to produce young jellies, known as ephyrae, which eventually grow into the familiar adult medusa form.