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Do fishes have a closed or open circulatory system

Do fishes have a closed or open circulatory system? Describe the number of chambers does a fish heart contain? How does blood flow all through the fish body?

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Since in every vertebrate, the circulatory system of fishes is closed, that is, blood flows merely in blood vessels. The fish heart has just two consecutive chambers: a thin-walled atrium and muscular ventricle. The arterial (or oxygenated) blood comes from gills and gains arteries in the direction of tissues, then venous blood is collected by the veins and reaches atrium of the heart passing to the ventricle which pumps the venous blood in the direction of gills to be again oxygenated

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