“…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; Bostanci & Yedier, 2018; de Carvalho, Spach, et al., 2019; de Carvalho, Volpedo, 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). Some authors consider aspect ratios, such as the relationship between otolith length and fish size or the otolith mass and fish size (de Carvalho, Spach, et al., 2019; de Carvalho, Volpedo, et al., 2019; Jaramillo et al., 2014; See et al., 2016).…”