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T.derasa |
One of the smaller tanks in the aquarium has a new exhibit – a small member of one of the largest bivalves on earth, the Southern Giant Clam
Tridacna derasa. With a maximum size of 60cm, it exceeded only by
T.gigas, which can reach nearly 1m across. While they are of course exceeded in mass by several species of squid, for a mollusc that is still a pretty respectable size, and the weight of the heavy shell increases their bulk. This giant size is all the odder when it turns out they are actually most closely related to the standard small cockles,
Cerastoderma, that can be found around the shores of the UK. This is not due to an especially long life, but rather rapid growth rates – they can be 30cm across within 10 years in some species.