The scale morphology of a native goby, Awaous jayakari (Gobiidae) was studied using scanning electron microscopy and light microscopy. The morphological descriptions were based on the scale's type, shape, and features of the anterior, posterior, and lateral fields. Further characteristics of the focus, circuli, radii, lepidonts, and cteni, were investigated. Morphometric indices were calculated for some scales. Shape variability of scales was high in different regions. However, the majority of scales displayed a polygonal shape (hexagonal and pentagonal). Both ctenoid and cycloid scales were observed in the studied fishes. The ctenoid scale of A. jayakari was peripheral and characterized by the presence of one row of marginally located spines in two completed and uncompleted subtypes. The focus was positioned posteriorly or postero-centrally. The microscopic examinations revealed the presence of lepidonts of different sizes being very tiny, small, or prominent performing flat, blunt, pointed, short, or truncated shapes. The rostral margin of the scales was convex to moderately flattened and represented striate, scalloped, or waved types. Lateral fields were often flattened in all regions, while convex in the lateral fields of the scales of some individuals. The posterior field showed variations in different regions, for example, tapered and flattened ends. The anterior–posterior axis presented a laterally expanded or an elongated extension. The considerable morphological variation in the scales of various body regions makes it difficult to nominate a typical scale to be used in taxonomic studies. However, the key scales can be used for the comparison of different Awaous species.

中文翻译：

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长鼻虾虎鱼 Awaous jayakari (Teleostei: Gobiidae) 鳞片的形态和微观结构特征：光学和扫描电子显微镜方法

使用扫描电子显微镜和光学显微镜研究了原生虾虎鱼的鳞片形态，Awaous jayakari（Gobiidae）。形态描述基于尺度的类型、形状和前、后和侧场的特征。研究了焦点、圆环、半径、lepidonts 和 cteni 的进一步特征。计算了一些尺度的形态学指数。不同地区的鳞片形状变异性较大。然而，大多数尺度显示多边形形状（六边形和五边形）。在研究的鱼类中观察到栉鳞和摆线鳞片。A. jayakari的栉鳞是外围的，其特征是在两个完整和未完成的亚型中存在一排边缘位置的刺。焦点位于后部或后中央。显微镜检查显示存在不同大小的鳞齿兽，它们非常小、小或突出，表现出扁平、钝、尖、短或截断的形状。鳞片的喙缘凸出至中度扁平，呈条纹状、扇形状或波浪状。侧场在所有区域往往是平坦的，而在一些个体的鳞片的侧场中则是凸起的。后场显示不同区域的变化，例如，锥形和扁平末端。前后轴呈现横向扩张或拉长的延伸。身体各部位尺度的显着形态变化使得难以指定用于分类学研究的典型尺度。但是，关键量表可用于比较不同的Awaous物种。