Blue Cannonball Jellyfish are so called due to their super-round appearance, almost ball like in shape, along with their stunning bright blue colour.

Blue Cannonball Jellies (Stomolophus Meleagris) is also referred to as the “cabbagehead jellyfish”, and are most commonly found in North American waters, but can also be found off the coast of Brazil and in some areas of the Pacific Ocean.

The bell of blue cannonball jellies is bright blue in colour, and can feature cream or dark markings around the edges of the bell.

With many oral arms that extend underneath the bell, these are used for collecting food and also for providing propulsion – these are some of the more active jellyfish species we provide.

In terms of food, this species is suitable for feeding with either dried food or live food (baby brine shrimp).

Blue Cannonball Jellyfish Facts

• Lifespan: 18 months
• Sting: None
• Water Temperature: 24-28°C
• Food: Baby Brine Shrimp, alongside dried foods such as our Cubic Medusa Jellyfish Food or Instant Brine Shrimp.
• Maximum Size: 10cm (4 inches)
• Compatible with: No other species. Must be kept only with other Cannonball Jellyfish.

Compatible Species

Blue Cannonball Jellyfish must only be kept in a tank with other jellies of the same species, and as such cannot be mixed with other species that we sell.

Watch Cannonball Jellyfish in Action

Blue Cannonball Jellyfish Size Guide

Our Jellyfish are sold at a young age, therefore offering you the maximum possible lifespan for your fish. There is no need for you to select a size, we send young jellyfish with a mixture of sizes. These are:

• ‘Juvenile’ size (roughly 2.5cm (1 inch) in diameter)
• ‘Small’ size (roughly 8cm (3 inches) in diameter).

The size of jellyfish you receive ultimately depends on our stock, but we always send juvenile/young jellies.

Blue Cannonball Jellyfish Feeding Guide

Blue Cannonball Jellyfish can be fed with either dried food (Cubic Medusa Jellyfish Food or Instant Brine Shrimp, or equivalent), or live food (Baby Brine Shrimp).

With all dried foods, you will end up with uneaten food being left over. It’s important to remove this uneaten food from your tank, or risk high ammonia rates in your water as the food begins to rot. Therefore live food is always preferable, in order to minimise waste and improve water quality.