2007-03-15 17:21:21 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Fish receive oxygen from the water. The water enters the fish through its mouth and it is passed over the gills located on the right and left side of the head. The gills are loaded with capillaries that extract the oxygen from the water. This blood is then sent to the body through the circulatory system. After the oxygen has been exchanged with carbon dioxide it is sent back to the gills. It first has to pass through the fish's 2 chambered heart where it is pumped to the gills.
2007-03-16 02:05:26 · answer #1 · answered by ATP-Man 7 · 0⤊ 0⤋
All fishes obtain oxygen via gill slits (covered or noncovered) located in the side of their bodies. The circulation is done like us (arteries and veins).
Some aquarium fish (gourami, guppies, catfish) and lung fish need additional oxygen from air which they take while surfacing by opening their mouths.
Certain fishes also breath through the slits between scales.
2007-03-15 17:25:06 · answer #2 · answered by Tiger Tracks 6 · 1⤊ 1⤋