As a result of a genetic trait G Hesliim oers comm

Figure 12.2 Tridacna derasa

Upper and lateral view of shell.

Below: Map with geographical distribution of the clam. After Lucas 1988.

Clam ShellImages Inherited Traits

A possible hybrid cross between T. derasa and T. gigas, as mentioned in the text. The specimen is tank-raised. It is also possible that this is only a localized form of T. derasa with features similar to T. gigas. Note the clear windows at the center of the mantle, like T. gigas, and the unusual small teardrop-shaped clear windows scattered over the mantle. J.C. Delbeek.

Compare the "hybrid" or unusual form of T. derasa on the left with the typical tank-raised T. derasa from Palau, right. The colouring of the mantle on the unusual specimen is also similar to patterns found in T. squamosa. J.C. Delbeek.

Tridacna Gigas

A young Tridacna gigas. Note the typical small blue rings scattered over the mantle, and clear windows in the central area. J.C. Delbeek.

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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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