Abstract
Ctenophores and jellyfish are most difficult marine invertebrates to maintain in artificial aquaria. They require circulating water to distribute a constant supply of live food and to disperse mucus and slime which these animals produce in abundance. They are easily trapped in filter intakes and overflow tubes, and they can be damaged or destroyed in the turbulence produced by air stones. Two practical and inexpensive aquarium systems designed specifically to overcome these problems are described—one for the hatching and semi-automatic harvesting of large quantities of brine shrimp larvae, and a second for the long term maintenance of ctenophores and jellyfish.

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