Cannonball Jellyfish (Stomolophus meleagris)

The cannonball jellyfish (Stomolophus meleagris) is a distinctive species common in tropical and sub-tropical waters of the Eastern Pacific and the Western Atlantic. They vary in colour depending on geographical location. Those in the Atlantic tend to be milky reddish, yellow or white in colour. Those from the Pacific are bluish or grey in colour (Stomolophus sp.2). True to its name, it has a robust, spherical bell that resembles a cannonball, often with a milky brown or white colouration and a distinctive brown band around its rim. Its short, frilly oral arms cluster underneath, giving it a compact appearance. Cannonballs are strong horizontal and directional swimmers, generally found near the surface, but can be found at depths up to 85m (280 feet). Its sting is very mild, posing little threat to humans. This species is also commercially harvested for its value as a culinary export, particularly in Asia.

Notes: For optimal health and stability, maintain a salinity of 25-30ppt. Successful rearing to a large size requires frequent feeding of baby brine shrimp throughout the day, as their high activity level creates a substantial energy demand. It is also essential to keep the tank clean and remove debris to prevent them from ingesting it, which can lead to internal necrosis.
The polyps can be kept at room temperature, and the strobilation occurs periodically. Freshly hatched brine shrimps are suitable for culturing both polyps and ephyrae.