The image displays two black and white illustrations of a fish ruler. Each ruler is marked with a series of numbers ranging from 0 to 20, indicating the length of the fish in centimeters. The rulers are designed with a fish shape at the top and a series of horizontal lines representing the body of the fish. The numbers are evenly spaced along the length of the ruler, providing a clear and easy-to-read measurement scale. The rulers are simple and straightforward, with no additional decorations or elements.