淡水鱼类 鳃和皮肤吸水;粪便和尿液损失盐分。 肾脏排水,鳃上的氯细胞(吸盐细胞)从水中吸 收盐分,从食物补充盐分。 absorbs water through gills(and skin) body fluids ca 300 mOsm/kg medium <5 mOsm/kg obtains salts through salts lost chloride"cells in gill via feces removes much water and some salt via dilute urine and with food FIGURE 13-1. Diagram summarizing osmoregulation of freshwater teleost
11 鳃和皮肤吸水；粪便和尿液损失盐分。 肾脏排水，鳃上的氯细胞（吸盐细胞）从水中吸 收盐分，从食物补充盐分。 淡水鱼类
海产硬骨鱼类 鳃和皮肤失水;尿液会排除一些水。 吞食海水和从食物中获取水分、鳃上的泌盐细胞将多 余的盐分排出体外。粪便和尿液也排除多余的盐分。 loses water through gills and ski body fluids ca 400 mOsm/kg medium ca 1000 mOsm/kg removes salts via"chloride salts lost cells in gills via feces salts and little water lost via scant urine gains water and salts by swallowing seawater and food FIGURE 13-3. Diagram summarizing osmoregulation of marine teleost
12 鳃和皮肤失水；尿液会排除一些水。 吞食海水和从食物中获取水分、鳃上的泌盐细胞将多 余的盐分排出体外。粪便和尿液也排除多余的盐分。 海产硬骨鱼类