Adamek-Urbańska Dobrochna, Błażewicz Ewelina, Sobień Magdalena, Kasprzak Robert, Kamaszewski Maciej
Department of Ichthyology and Biotechnology in Aquaculture, Institute of Animal Science, Warsaw University of Life Sciences, Ciszewskiego 8, 02-786 Warsaw, Poland.
Animals (Basel). 2021 Apr 17;11(4):1158. doi: 10.3390/ani11041158.
Accessory respiratory organs (AROs) are a group of anatomical structures found in fish, which support the gills and skin in the process of oxygen uptake. AROs are found in many fish taxa and differ significantly, but in the suborder Anabantoidei, which has a labyrinth organ (LO), and the family Clariidae, which has a dendritic organ (DO), these structures are found in the suprabranchial cavity (SBC). In this study, the SBC walls, AROs, and gills were studied in anabantoid (, , ) and clariid (, ) fishes. The histological structure of the investigated organs was partially similar, especially in relation to their connective tissue core; however, there were noticeable differences in the epithelial layer. There were no significant species-specific differences in the structure of the AROs within the two taxa, but the SBC walls had diversified structures, depending on the observed location. The observed differences between species suggest that the remarkable physiological and morphological plasticity of the five investigated species can be associated with structural variety within their AROs. Furthermore, based on the observed histology of the SBC walls, it is reasonable to conclude that this structure participates in the process of gas exchange, not only in clariid fish but also in anabantoids.
辅助呼吸器官（AROs）是在鱼类中发现的一组解剖结构，在氧气摄取过程中辅助鳃和皮肤进行呼吸。AROs存在于许多鱼类分类群中，且差异显著，但在具有迷路器官（LO）的攀鲈亚目和具有树枝状器官（DO）的胡子鲶科中，这些结构位于鳃上腔（SBC）。在本研究中，对攀鲈科（ 、 、 ）和胡子鲶科（ 、 ）鱼类的鳃上腔壁、辅助呼吸器官和鳃进行了研究。所研究器官的组织结构部分相似，尤其是在结缔组织核心方面；然而，上皮层存在明显差异。在这两个分类群中，辅助呼吸器官的结构没有显著的物种特异性差异，但鳃上腔壁的结构因观察位置而异。观察到的物种间差异表明，所研究的五个物种显著的生理和形态可塑性可能与其辅助呼吸器官内的结构多样性有关。此外，基于观察到的鳃上腔壁组织学，有理由得出结论，这种结构不仅在胡子鲶科鱼类中，而且在攀鲈科鱼类中都参与气体交换过程。
