To examine certain features on scale surface, scales from three body regions (Head scale, Belly scale and Caudal scale) were removed, cleaned and prepared for SEM analysis. The differences among the scales were primarily due to the different types of scale that was either ctenoid or cycloid.read more read lessĪbstract: In present study, scale morphology and microstructure of Priacanthus hamrur from Veraval harbour, Gujarat, India was studied with using of Scanning Electron Microscope (SEM). Species that showed the least significant differences among species was Probarbus jullieni (Sauvage 1880). Pristolepis grootii (Bleeker 1852) was the only one that significantly different (p<0.05) from other 16 species in the first three indices. It was found that all 17 species showed significant differences with at least one other species in all four indices. The inter-specific variation among scales was indicated by L1/L, L2/L, L1/L2 and W/L indices through multiple comparison tests (ANOVA). Measurements of scale total length (L), total width (W), rostral field length (L1) and caudal field length (L2) of the scales were taken using Image J software. Keys to species were constructed based on these scale morphological characters described. The morphological descriptions were based on types of scales, distinctiveness of radii arrangement at the anterior field, radii cover, radii distribution, overall shape, focus position and focus pattern. The scales were removed, soaked in H2O2 (0.5%), NH3 (0.3%), DH2O and mounted between a pair of glass slides for digital photographing. Each species was represented by ten individuals (size ranges 2.5 - 50 cm TL). Specimens caught were from 3 families (Cyprinidae, Channidae, Nandidae) and 17 species. Fishes were sampled from selected rivers of Tembat Forest Reserve, Hulu Terengganu. This study aimed to describe morphological characteristics of scales and use the differences to prepare keys to species. 673Ībstract: Scales are calcium carbonate and collagen-contained structures embedded within the fish epidermis and useful for species identification. Identification of three fish species of genus Plectorhynchus from the Red Sea by their scale characteristics. Among the scale characteristics used to differentiate between Plectorhynchus species are the overall shape of the lateral line canal, the relative position of its anterior and posterior openings and the cantilevered anterior extension of the canal. The pattern of variations reflected by CVA referred to the partial discrimination between the three Plectorhynchus species considered. In addition to the intraspecific variations, the highly significant interspecific variations in the morphometric indices also were evident from one body region to another (P<0.01). schotaf, and the second subcluster includes P. The quantitative scale characters of Plectorhynchus species are subjected to cluster analysis that revealed two main subclusters, the first includes P. A wide spectrum of size-free intraspecific and interspecific variations was recorded and documented concerning the overall form of the scales and their morphometrics, scale surface morphology, the primary, secondary and tertiary radii counts, shape of interradial tongues and the first circuli, the interradial circuli, most outer lateral circuli, inner lateral circuli, denticles on circuli, interradial and intercircular grooves, segmentation and granulation pattern of the caudal field and the shape of ctenii. The present work has been suggested to the rarity of taxonomic and biological information about the three Plectorhynchus species, P. TL DR: Among the scale characteristics used to differentiate between Plectorhynchus species are the overall shape of the lateral line canal, the relative position of its anterior and posterior openings and the cantilevered anterior extension of the canal.Ībstract: Scale characteristics and its detailed structure from different body regions were studied in three Plectorhynchus species in terms of morphometry and Scanning Electron Microscopic techniques.
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