Background A study of the olfactory organ structure in freshwater catfish, Eutropiichthys vacha , was carried out to explore the cellular constituents by aid of light as well as scanning and transmission electron microscopy. Results The paired elongated olfactory organs were situated on the dorsolateral facet of the head in the mold of simple pits. The olfactory organ was made up of a series of leaflets, the lamellae, which embedded into both sideways of slender central raphe, forming a rosette distinguished with sensory and nonsensory areas. The sensory receptor cells were present on sideward surface and linguiform process of olfactory lamella while the rest of the portion of the lamella was lined with nonsensory epithelium. Olfactory cells were characterized by their staining intensity, outline, surface features, and comprehensive morphology in the epithelium. The sensory mucosa was defined by the occurrence of three types of neuron: classic types bearing either cilia or numerous microvilli and third type having rod-shaped architecture. The nonsensory epithelium was composed of mucous cells, labyrinth cells, mast cells, and two types of supporting cells categorized as ciliated or nonciliated. Basal cells lie deep in the olfactory lining, near the central core. Conclusion The structural components of the olfactory apparatus crucial for olfaction were correlated with the behavioral activities of fish.

中文翻译：

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schilbid catfish Eutropiichthys vacha (Hamilton, 1822) 的嗅觉器官：形态学和超微结构研究

背景 对淡水鲶鱼 Eutropiichthys vacha 的嗅觉器官结构进行了研究，以借助光以及扫描和透射电子显微镜来探索细胞成分。结果成对的细长嗅觉器官位于头部的背外侧面，在简单的凹坑模具中。嗅觉器官由一系列小叶组成，薄片嵌入细长的中央中缝的两侧，形成一个区分感觉和非感觉区域的莲座丛。感觉受体细胞存在于嗅板的侧面和舌状突起，而板的其余部分衬有非感觉上皮。嗅觉细胞的特征在于它们的染色强度、轮廓、表面特征、和上皮的综合形态。感觉粘膜由三种类型的神经元的出现定义：带有纤毛或众多微绒毛的经典类型和具有杆状结构的第三类型。非感觉上皮由粘液细胞、迷路细胞、肥大细胞和两种类型的支持细胞组成，分为纤毛或非纤毛。基底细胞位于嗅觉衬里的深处，靠近中央核心。结论对嗅觉至关重要的嗅觉器官的结构成分与鱼类的行为活动相关。迷路细胞、肥大细胞和两种类型的支持细胞，分为纤毛或非纤毛。基底细胞位于嗅觉衬里的深处，靠近中央核心。结论对嗅觉至关重要的嗅觉器官的结构成分与鱼类的行为活动相关。迷路细胞、肥大细胞和两种类型的支持细胞，分为纤毛或非纤毛。基底细胞位于嗅觉衬里的深处，靠近中央核心。结论对嗅觉至关重要的嗅觉器官的结构成分与鱼类的行为活动相关。