Fish uses closed circulation system meaning that blood is contained in the blood vessels system implying that blood does not leave the blood vessels system (Chandra, 2010). Fish usually has two heart chambers meaning that it has a single circulation system. The water passes through the mouth to the gills and the oxygen is absorbed. The oxygenated blood in the gills is transported to the body tissues and carbon dioxide is taken out of the tissues to the blood and transported to the gills and as the water passes through the gills carbon dioxide is removed (Chandra, 2010).
Waste is filtered from blood by the kidney and removed through anal fin or external opening to reproductive tract and digestive urinary (Chandra, 2010). The kidney is very significant in modifying salt and water concentrations in the body of the fish, thus allowing specific species of fish to live in saltwater or freshwater or both (Farabee, 2001).
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