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Ecological studies on the mussel mytilus galloprovincialis 2. a simple age estimation method by light penetration


, : Ecological studies on the mussel mytilus galloprovincialis 2. a simple age estimation method by light penetration. Venus the Japanese Journal of Malacology 42(3): 269-288

Age determination of M. galloprovincialis Lamarck was done by a light penetration method. As the shells of this species are applied to penetrating light, a striped pattern is recognized by bands through which the light can and cannot pass. The latter portions are formed in the summer and autumn; the light passable portions are formed in the spring. The number of light transmittable bands coincides with the age of the shell. The boundaries between these 2 kinds are very clear. Along these boundaries, the so-called annual rings, which were formed in the winter exist. By applying the light penetration method together with the winter ring count the age of the mussel can be precisely determined.

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