Blue Blubber Jellyfish are some of the most common species of jellyfish which can be kept as pets.

These blue blubber jellyfish (Catostylus mosaicus) have some of the most distinctive shapes, with a dome shaped bell and eight arms which provide an almost-cauliflower appearance.

While the colour blue is in their name, their popularity actually comes from the wide variety of colours that are available. Typical colours range from light blues, dark purples and even burgundy. White and brown coloured blubber jellyfish are also available – it is thought that the colour of the jellyfish depends on the type of symbiotic algae which live inside their bodies.

Their eight arms offer excellent rhythmic propulsion and they are therefore strong, active swimmers, always offering plenty to watch inside the tank.

Blue Blubber Jellyfish Facts

• Lifespan: Up to 1 Year
• Sting: None
• Water Temperature: 24-28°C
• Food: Baby Brine Shrimp, alongside our Cubic Medusa Jellyfish Food.
• Maximum Size: 10cm (4 inches)
• Compatible with: Red Cross Jellyfish

Compatible Species

Blue Blubber Jellyfish are a friendly species and can live in close proximity with other species, specifically the Red Cross Blubber Jellyfish – as well as other Blue Blubbers of course!

Watch Blue Blubber Jellyfish in Action!

Blue Blubber 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).

We do not stock Medium or Large size Jellyfish, but be aware that your fish will of course grow in their lifetime.

Blue Blubber Jellyfish Lifespan Guide

Blue Blubber Jellyfish are able to live for up to 1 year in any of our jellyfish tanks.

Caring for Blue Blubber Jellyfish

They are strong and active swimmers, and are temperate water jellyfish. Blue Blubber Jellyfish will need feeding with baby brine shrimp, frozen baby brine shrimp, Ocean Nutrition Instant Baby Brine, or frozen copepods, for about 1-2 times a day. You can pick up most of these from your local aquatic shop. You can also top up Blue Blubber’s feeding with our own Medusa Jellyfish Food.

Blue Blubbers have a life span of up to 1 Year in captivity, preferring medium to fast water flow.

As they are strong swimmers, your aquarium should be on a relatively high water flow speed to prevent them hitting the sides of the tank.