Abstract
The present study aims to determine the otolith and scale morphology of Cyprinion macrostomum in the Tigris–Euphrates Basin. A total of 50 specimens are evaluated, and total length and body weight values of samples are ranged 6.7–10.4 cm, and 2.7–10.9 g, respectively. The asteriscus and lapillus pairs are examined, and also the scales from the six body regions of juvenile and adult C. macrostomum samples are investigated. The otolith characters such as shape, size, proximal and distal surfaces, antirostrum and rostrum types and the scale morphological characters such as type, size, shape, focus position, circuli appearance, radii type, and rostral and caudal margin shapes are the distinguishable characters for the C. macrostomum samples. Whereas asteriscus pairs shape is discoidal, lapillus pairs shape is kidney-shaped for C. macrostomum samples. When the scales in six different body regions of C. macrostomum are compared, there are differences between the scale shapes obtained from six different regions.
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