Competition for space is one of the most important factors limiting populations on marine hard substrata. Obviously there must be some sort of controls to allow a high diversity of life to exist in such a limited area. This is why sessile colonial marine organisms such as anemones, sponges, soft and stony corals have developed various mechanisms for defending their space and moving into new ones (Sammarco et al., 1983). Failure to recognize this fact can cause a lot of frustration for the aquarist, and can lead to many expensive losses. Sometimes prédation controls growth, but this is usually not a factor in our aquariums, at least it shouldn't be! There are four main mechanisms that marine invertebrates use to establish their territory: rapid growth to "shade-out" competitors; the development of aggressive structures such as mesenterial (gut) filaments, sweeper tentacles and acrorhagi and; the release of toxic compounds into the water. In many cases an organism will use a combination of these tactics.
Acontia filaments produced along the growing margin of a section of an Acropora cervicornis branch that had grown onto the front glass of an aquarium. These acontia swept the surface of the glass, killing algae there before the tissue growth advanced over the area. J. Sprung.
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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.