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Blood moves to the gills and their surface and its lamellae. ("The lamellae is the most important part of the gills since this is where gas exchange actually takes place. Fish have 2 ways of getting their oxygen full "that is diffused by the gills  

Inside the fish theres something called the lamellae (The lamellae is an organ that the fish has to help it breathe.) and theres tiny blood cells and theres a blood vessel that bring the blood really close to the surface. When water goes into the gills,oxygen goes to the fish. When blood carries oxygen to the lamellae it doesn't have a lot of oxygen. Blood swims through the blood vessels and water swims the opposite way to the lamellae. That way, blood swims through the gills but it was a little less oxygen than the water around it. When the blood can't hold any more oxygen it swims its way to the heart.  

To get oxygen the fish just moves with their mouth open or take a gulp of water  

The bigger the lamellae is the better blood can hit contact with water and the fish can get more oxygen

The lamellae has evolved so much to have the most surface area it can have