The potential respiratory surfaces of a fish living in a historically polluted river

摘要: The acquisition of oxygen is fundamental for maintaining metabolic activity in fish, and most species obtain through aquatic gill respiration. Throughout evolution, different fish lineages have evolved secondary routes to from atmospheric air, the spinycheek sleeper, Eleotris pisonis, may be one example such bimodal Gill structure top epithelium head E. pisonis Subae River (Santo Amaro, Bahia, Brazil) were evaluated morphometrically. gills showed histopathologies, especially proliferation, which was prevalent on 35.6% filaments 13.7% lamellae, probably increasing water-blood diffusion barrier lamellae 5.48 ± 1.32 μm, similar air-blood distance skin (5.77 ± 1.72 μm). Quantitative morphometric analysis histopathologies distances could considered as biomarkers, also suggest presence cutaneous respiration a possible strategy aerial acquisition.