Unlike landscape painting and the preparatory drawing we learned in high school and earlier, sketches in ichthyology experiments are not ones for which artistic quality is demanded. They are rather understood as being similar to architectural and machinery designs in engineering, and “what you see” rather than “good-looking” works are demanded. In other words, sketching is a method to accurately depict the morphological characteristics of subject fish in detail. Demonstration of the ratio and/or the position of body parts will require observations from the front and rear, right and left, and top and bottom. Basically, sketching uses only sharp lines and stippling, but not techniques of “gradation”, “shading”, and the like. In other words, structures are represented by solid lines, whereas three-dimensional parts (unevenness) and characteristic markings are indicated by stippling..