Fish Physiology and Biochemistry ( IF 2.5 ) Pub Date : 2021-05-17 , DOI: 10.1007/s10695-021-00963-4 F Juliane M Ceron 1 , Viviane Prodocimo 1 , Carolina A Freire 1
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Ray-finned fishes of the superorder Ostariophysi are primarily freshwater (FW), and normally stenohaline. Differently, fishes of the superorder Acanthopterygii are essentially marine, and frequently euryhaline, with some secondary FW. Na+/K+-ATPase-immunoreactive ionocytes were localized in the branchial epithelia of 4 species of Ostariophysi and 3 of Acanthopterygii. The Ostariophysi grass carp (Ctenopharyngodon idella, Cypriniformes), twospot Astyanax (Astyanax bimaculatus) and piracanjuba (Brycon orbignyanus), Characiformes, and the jundiá (Rhamdia quelen, Siluriformes), all from FW, displayed ionocytes in the filament plus secondary lamellae (F + SL). In their turn, all the three species of Acanthopterygii showed immunoreactive ionocytes in the filaments only (F). They were the Nile tilapia (Oreochromis niloticus, Cichliformes) in FW, the dog snapper (Lutjanus jocu, Perciformes) in seawater (SW), and the green puffer (Sphoeroides greeleyi, Tetraodontiformes) in SW. Ionocytes normally extend their distribution to the secondary lamellae (F + SL) in Ostariophysi. In Acanthopterygii, we find more plasticity: ionocytes are more frequently restricted to the filament in SW, but also spread to SL in FW. It may be that the occurrence of ionocytes in SL is the ancestral condition, but some euryhaline acanthopterygians rely on the space of the SL for placement of additional ionocytes when in FW absorbing salt. Our study contributed to the identification of the pattern of ionocyte distribution in gills of Ostariophysi in respect to that of Acanthopterygii.
Graphical abstract
中文翻译：
Na + /K + -ATPase 免疫反应性离子细胞的分布在两个射线鳍鱼超目之间变化：Ostariophysi 和棘鳍总目
Ostariophysi 超目鱼鳍鱼主要是淡水 (FW)，通常是狭盐鱼。不同的是，棘鳍总目鱼类本质上是海生的，通常是广盐性的，还有一些次生的 FW。Na + /K + -ATPase 免疫反应性离子细胞位于 4 种 Ostariophysi 和 3 种棘翅目鳃上皮细胞中。Ostariophysi 草鱼（Ctenopharyngodon idella， Cypriniformes ）、双斑鱼（Astyanax bimaculatus）和食人鱼（Brycon orbignyanus）、 Characiformes 和 jundiá （Rhamdia quelen, Siluriformes), 全部来自 FW, 在细丝中显示离子细胞加上次级薄片 (F + SL)。反过来，所有三种棘翅目仅在细丝中显示出免疫反应性离子细胞（F）。它们是FW中的尼罗罗非鱼（Oreochromis niloticus，Cichliformes ），海水（SW）中的狗鲷（Lutjanus jocu，Perciformes）和绿河豚（Sphoeroides greeleyi）, Tetraodontiformes) 在 SW。离子细胞通常将它们的分布扩展到 Ostariophysi 中的次级薄片 (F + SL)。在棘翅目中，我们发现了更多的可塑性：离子细胞在 SW 中更频繁地局限于细丝，但在 FW 中也扩散到 SL。可能SL中离子细胞的出现是祖先的条件，但是一些广盐性棘鳍鱼在FW吸收盐时依靠SL的空间来放置额外的离子细胞。我们的研究有助于确定 Ostariophysi 鳃中的离子细胞分布模式与棘翅目相比。
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