Karadeniz Bölgesi’nden Örneklenen Lüfer Balığının, Pomatomus saltatrix (Linnaeus, 1766) Otolit Şekil Analizi

Abstract

In this study, otolith shape indices and relationships between otolith shape and otolith length of the bluefish Pomatomus saltatrix (Linnaeus, 1766), which was sampled from the Samsun offshore of the Black Sea were investigated. A total of 166 samples (94♀ and 72♂) were taken from commercial fishermen in two different fishing seasons (October-December 2014 and January 2018). Sagittal otoliths of each sample were removed and six different shape index (form factor, roundness, circularity, rectangularity, ellipticity and aspect ratio) were used in analyses. The linear model is preferred for calculating the relationships between otolith shape properties and otolith length. Paired t-test, Wilcoxon test, Independent t test and Mann-Whitney U test were used for statistical analysis. The minimum and maximum total lengths and weights of the captured samples are between 13.5-24.8 cm and 22.01-161.19 g, respectively. There is no difference between female and male in terms of total length and weight. When otolith dimensions of female and male were compared, there were no differences in terms of otolith length (OL), otolith breadth (OB), otolith perimeter (OP) and otolith area (OA) (P˃0.05). However, according to left and right otoliths comparisons, there were differences in terms of otolith breadth and otolith perimeter (P˂0.05). Ellipticity was found to have a much stronger relationship with otolith length than the other five parameters (r 2 ˃0.590).

Invariant morphological descriptors from otolith shape in environment automatic classification

“…Some morphometric descriptors have been reported to analyse otoliths shape, among them the classic measures such as otolith length, width, thickness, and weight Freire et al, 2017;Volpedo & Echeverrıá, 2003). There are morphometric internal descriptors from the whole object and external descriptors from the contour of the object, such as area, perimeter, length of main axes (major axis and minor axis), and Feret distances (length, width, diameter;Bostanci et al, 2015;Iestyn-Mapp, 2015;Ladroit et al, 2017;Montanini et al, 2017;Ozpicak et al, 2019;Skeljo & Ferri, 2012;Tuset et al, 2003;Zorica et al, 2010). Classic geometric indexes show the relationships between otolith shape and conventional geometric shapes such as circularity, rectangularity, ellipticity, and bounding box (Bostanci et al, 2015;de Carvalho, Spach, et al, 2019;Cerna et al, 2019;Iestyn-Mapp, 2015;Ladroit et al, 2017;Montanini et al, 2017;Ozpicak et al, 2019;See et al, 2016;Skeljo & Ferri, 2012;Tuset et al, 2003;Zorica et al, 2010).…”