摘要: The structure and function of the gills freshwater fish are briefly summarized responses to low pH reviewed, with particular reference salmonid fishes. Major influences seen upon ion acid–base regulatory mechanisms at mucous secretion gill structure. Ionic imbalances which can be responsible for death caused by disturbances both active transport diffusional losses Na+ Cl−. disturbances, while not identical two ions, similar extent that undirectional fluxes dependent severity duration acid exposure external calcium concentration. Calcium also has an important influence on net flux H+ across gills. A model is proposed interaction Ca2+ function. physiological importance discussed issue whether acid-intolerant species successfully adapted life ...