Types of Blood
Fish are cold-blooded aquatic vertebrates and can be found in both saline and freshwater. Its circulatory system is responsible for transporting blood and nutrients throughout the body. It has a closed circulatory system, i.e. blood travels across the body through the network of blood vessels. Unlike humans, fish exhibit single cycle circulation, where the oxygen deprived blood comes to the heart, from where it is pumped to the gills and then circulated to the entire body. On the other hand, in mammals, the deoxygenated blood enters the heart, from where it is pumped into the lungs for oxygenation. Then, the oxygenated blood returns to the heart from the lungs, to be transported throughout the body.
taken from: http://www.buzzle.com/articles/circulatory-system-of-a-fish.html
most fish are cold blooded but some are warm blooded like tuna
taken from : http://www.answers.com/Q/Is_a_fish_cold_blooded_or_warm_blooded
taken from: http://www.buzzle.com/articles/circulatory-system-of-a-fish.html
most fish are cold blooded but some are warm blooded like tuna
taken from : http://www.answers.com/Q/Is_a_fish_cold_blooded_or_warm_blooded