Since the summer of 2011, Switzerland's Zoo Basel has been working behind the scenes with their new breeding vivarium equipment called "Plankton Kreisel". It ensures that baby jellyfish float like the ocean - in a continuous flow.They are so delicate that they could not withstand the corners found in normal tanks. Thanks to a new method of breeding and rearing, they are thriving.
Jellyfish in the vivarium have different feeding rhythms and the Zoo will fluctuate the temperatures within it to stimulate reproduction. This system was discovered by accident when, in December 1987, a cooling system in the vivarium went out for two days. Surprisingly, the jellyfish began to multiply! Now It takes a lot of work and knowledge to employ this new method for breeding them, but it has become a successful effort.
Jellyfish are composed of two different life forms: affixed (polyps about 2 mm or .078 inches small) and free-swimming medusa, the actual "jellyfish". The polyps produce buds within the fluctuating environmental conditions, which detach with time and in the wild become jellies freely floating in the sea. Those jellyfish will in turn become sexually mature after a few months and then produce eggs and sperm.
Thanks to these new methods, jellies can again be seen on ehxibit at the Zoo in all their other-worldly beauty.
Photo credit: Zoo Basel