The gills take in oxygen through a counter current system its a backwards from high to low setup - ingenious really!
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Fish breathe using their gills. Gills are respiratory organs that extract oxygen from the water and release carbon dioxide. Water passes through the fish's mouth and flows over the gills, allowing the fish to absorb oxygen from the water.
It filters the water out. Basically the 'breath in' water and take the oxygen from it and the water filters out through the gills
Water flowing across the gills of fish is necessary for gas exchange to occur. This process allows the fish to extract oxygen from the water and release carbon dioxide. A continuous flow of water ensures a constant supply of oxygen for the fish to breathe.
All fish breath through their gills, there is oxygen in water, as such, they take the oxygen through their gills.
Fish breathe through their gills, which are specialized organs that extract oxygen from water. As fish swim, water passes over their gills, where oxygen is absorbed and carbon dioxide is released. This process allows fish to extract oxygen from water and use it for respiration.