Abstract
ONE of us (D. J. G.) is engaged in a statistical study of ring formation in the scales of Tilapia esculenta (Graham) from Lake Victoria. The rings on the scales of this fish are not so much formed by closer grouping of circuli as in temperate species, but rather consist of regions where the circuli are irregular or broken. Such rings are separated by regions where the circuli are regular and complete. Thus ring formation in this species would seem to be due not so much to a slowing of growth, but to continuance of growth in the scale under adverse conditions, resulting in imperfect calcification or formation of matrix.
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References
Lowe, R. H., “Observations on the Biology of Tilapia (Pisces: Cichlidae) in Lake Victoria, East Africa” (East African Fish. Res. Org. Supp. Pub. No. 1, 1956).
Krogh, A., “Osmotic Regulation in Aquatic Animals” (Camb. Univ. Press, 1939).
Van Someren, V., “A Preliminary Investigation into the Causes of Scale Absorption in Salmon (Salmo salar, Linné)”, No. 2 (Fisheries, Scotland, Salmon Fish., 1937).
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GARROD, D., NEWELL, B. Ring Formation in Tilapia esculenta . Nature 181, 1411–1412 (1958). https://doi.org/10.1038/1811411a0
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DOI: https://doi.org/10.1038/1811411a0
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