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Description: A new stimulus set is described that could prove useful for a wide variety of different cognitive experiments. Each stimulus is a schematic representation of a fish and the stimulus ensemble could potentially be varied on many dimensions. These new stimuli have a number of attractive properties, including 1) a higher degree of ecological validity than most stimuli used in cognitive research, and 2) a large number of qualitatively different types of dimensions that can be varied. Psychophysical properties of the stimuli were studied in two experiments. Experiment 1 measured just noticeable differences on two prominent dimensions, and Experiment 2 used multidimensional scaling to study the structure of the underlying perceptual representations. The result is an ecologically valid stimulus set with a well-understood perceptual representation.