JellyFish Facts

Freshwater Jellyfish Aquarium

Freshwater Jellyfish Aquarium picture

Freshwater Jellyfish Aquarium

There are about 200 varieties of jellyfish in the world, and most of them inhabit the seas and oceans. There are a few species, that are known to inhabit freshwater lakes and even man-made reservoirs. Although the jellyfish depends on water current for mobility, the freshwater jellyfish prefers waters that are calm and does much care for a river with a fast current.

One of the best known species of freshwater jellyfish is the Craspedacusta sowerbyi. They differ slightly in their structure from the seawater jellyfish. It has a hard and thin membranous part known as the velum, which curves inwards from the circumference of its bell and ends at its mouth. This jellyfish has known to have originated in the continent of South America, in the Amazon. Now it is found all over the world with the exception of Africa. This jellyfish is a small creature, and its bell measures around two centimeters in diameter, and feeds on the zooplankton. Consisting of 99% water this jellyfish is more delicate than the sea varieties.

A freshwater jellyfish aquarium can keep this type of jellyfish, and it is also possible to breed it in captivity. The freshwater jellyfish aquarium is only meant for jellyfish and no other fish can be kept in the same tank. Being delicate and sensitive, the jellyfish needs special care and the freshwater jellyfish aquarium needs special equipments to ensure that there are no fatalities. Even with all this it has been very difficult to keep the freshwater jellyfish alive till adulthood in captivity.

The freshwater jellyfish aquarium should have only a slow circulation of water in the tank as the freshwater jellyfish cannot withstand strong currents. If the water in the tank circulates faster, there is a danger also of the jellyfish colliding with the wall of the tank.

To breed the freshwater jellyfish in an aquarium, the inside of the tank should have small rocks or other hard decorations where the polyps can go and attach. The stages in its life cycle will remain the same in captivity, and also is the same as the saltwater varieties. In the asexual breeding process, the polyps which attach themselves on the rocks in the tank and will start budding and multiply. At this stage it is essential to keep the required temperature for it to mature further.

In the medusa stage when the jellyfish breeds sexually, it is easier to keep the male and female in the same tank and let them breed, rather than trying any artificial inseminating methods. The sexual breeding phase takes place quite effectively in captivity. The release of eggs by the female jellyfish in the water, is inseminated by the male jellyfish. The fertilised eggs will then form into Planulae which are actually the larvae. These will attach themselves to hard surfaces and form Polyps as described earlier.

Keeping the Craspedacusta sowerbyi, in freshwater jellyfish aquarium is not an easy task and a lot of work and care is involved. But it becomes all rewarding when you see these creatures floating around in the water, and get to observe their whole life cycle.

You can find more info on a Jellyfish Aquariums and how to keep Jellyfish in our Jellyfish Pets page, all you wanted to know about this fascinating creatures is on our site.

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Written by and Sudarsana Sinha.

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