Relief Structure of Coregonid Scale through Reconstruction of Stereopair Three-dimensional Images
Tyagun, Marina L.; Khodzher, Tatyana A.
The present work demonstrates a method for microrelief reconstruction of Baikal omul (Coregonus migratorius Georgi, 1775) scales using digital photogrammetry. Reconstruction of the relief layer of concentric, cycloid scales was performed with scanning electron microscopy combined with volume reconstruction of stereopair images. Methods detailing reconstruction of the microrelief structure of the anterior and posterior parts of scales have been specified. The central part of the scale corresponding to early life stages (here termed the “fry circle”) appears to have a concave shape. The biological significance of this phenomenon is discussed. These data provide an increased understanding of the different epidermal interactions of scale surfaces with the integument. This description of the structural principles of cycloid scales is useful when considered from an evolutionary perspective. Detailed data are required for further investigations of microrelief comparisons within and among coregonid fishes and with other contemporary fishes.