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exposing the actinopharynx and the mesenteries. Once fission is complete the torn ends of the column roll inwards and fuse (Chen et al, 1995a). The result is two or more offspring that quickly develop, attaining the size of the original polyp within a few weeks. Over the course of a year Chen et al (1995a) found 99 polyps of R. indosinensis asexually reproducing, 73 of which underwent longitudinal fission!

Chen et al (1995a) described a rare form of longitudinal fission in R. indosinensis they termed "two-mouth" fission. In this case the mouth only divides and the polyp has two mouths for a few weeks. The oral disc then pinches in from the sides, separating the mouths but leaving the pedal disc intact. Eventually the column splits longitudinally. The whole process takes approximately two months to complete.

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The COMPLETE guide to Aquariums

The COMPLETE guide to Aquariums

The word aquarium originates from the ancient Latin language, aqua meaning water and the suffix rium meaning place or building. Aquariums are beautiful and look good anywhere! Home aquariums are becoming more and more popular, it is a hobby that many people are flocking too and fish shops are on the rise. Fish are generally easy to keep although do they need quite a bit of attention. Puppies and kittens were the typical pet but now fish are becoming more and more frequent in house holds. In recent years fish shops have noticed a great increase in the rise of people wanting to purchase aquariums and fish, the boom has been great for local shops as the fish industry hasnt been such a great industry before now.

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