What does a fish have smooth streamlined shape?

A fish has a smooth streamlined shape in order to reduce drag and move efficiently through the water. The water exerts less resistance (friction) and less energy is utilized as it moves due to this shape. For a fish’s survival, such as capturing prey or escaping predators, efficient movement is significant. Smooth, streamlined contours allow for effortless and fast swimming capabilities and enable the fish to navigate through the varied conditions found in any freshwater or marine environment.