Salt Water Aquarium

I took one of my friends to the doctor today. I am always surprised about the locations that I become mindful of fluid mechanic principles. While I was sitting in the waiting room I noticed the salt water tank that was sitting in the corner of the room that was filled with unique salt water fish. I became mindful that all the fish in the tank were teardrop shaped. This is no coincidence, this is the most aerodynamic 3-D shape we have studied about, having a C_D of 0.04. This allows the fish to reduce the drag force acting on them so they are able to navigate their aquatic environment with minimal energy consumption.