Laboratorio de Neuroendocrinología y Comportamiento en Peces y Anfibios, Departamento de Biodiversidad y Biología Experimental, Instituto de Biodiversidad y Biología Experimental y Aplicada-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina.
J Morphol. 2022 Jun;283(6):815-826. doi: 10.1002/jmor.21473. Epub 2022 Apr 14.
The cardinal tetra Paracheirodon axelrodi belongs to the family Characidae, an economically important and morphologically diverse family of fishes. Information on the olfactory system of this species is scattered and scarce. Among teleost fishes, differences exist in the shape, number, and arrangement of the olfactory lamellae, in the distribution of the sensory and nonsensory epithelium, as well as in the abundance of various receptor cell types. Here, an anatomical and morphological description of the olfactory system was carried out using light microscopic histology, immunohistochemistry, scanning electron microscopy, and transmission electron microscopy. P. axelrodi is a ditremous and isosmat species. It has an arrow-shaped olfactory rosette arrangement. The olfactory epithelium is covering the 12-14 lamellae of the olfactory rosette and, using scanning electron microscopy, we observed that the apical surface of the olfactory epithelium carries a dense layer of mucus. Based on the histological, immunohistochemical, and ultrastructural descriptions, all characteristic sensory and nonsensory cell types of the olfactory epithelium of teleost fish were identified. Three types of olfactory receptor neurons were identified: ciliated, microvilli, and crypt cells. The distribution of sensory and nonsensory cell types is like that described in Aphyocharax anisitsi, another species of the Characidae family. A. anisitsi inhabits slow-flowing water bodies with high-density vegetation such as P. axelrodi.
彩裙鱼 Paracheirodon axelrodi 属于脂鲤科，这一科鱼类经济价值高，形态多样。有关该物种嗅觉系统的信息较为分散且稀少。在硬骨鱼类中，嗅瓣的形状、数量和排列、感觉和非感觉上皮的分布以及各种受体细胞类型的丰富程度存在差异。本研究采用光镜组织学、免疫组织化学、扫描电子显微镜和透射电子显微镜对彩裙鱼的嗅觉系统进行了解剖学和形态学描述。彩裙鱼为双凹型和等背鳍型物种，具有箭形的嗅球排列。嗅上皮覆盖在 12-14 个嗅瓣上，使用扫描电子显微镜观察到嗅上皮的顶表面带有一层密集的黏液。根据组织学、免疫组织化学和超微结构描述，确定了硬骨鱼类嗅上皮的所有特征性感觉和非感觉细胞类型。鉴定出了 3 种嗅觉受体神经元：纤毛细胞、微绒毛细胞和隐细胞。感觉和非感觉细胞类型的分布与脂鲤科的另一种鱼类 Aphyocharax anisitsi 相似。A. anisitsi 栖息于水流缓慢、植被茂密的水体中，与彩裙鱼的生境相似。
