Fish images were acquired after brief anesthetization with MS222 using an Olympus SZX12 epifluorescence stereomicroscope or a Zeiss Discovery epifluorescence stereomicroscope, interfaced to Axiocam HR and MR3 cameras and Axiovision software. Most fish were imaged either immersed in 1% methylcellulose or after placement on an agarose-lined dish. Juvenile and adult fish were deeply anesthetized, placed on a plastic dish, gradually covered with warm agarose and, after agarose had hardened, dishes were inverted and fish imaged through the flat bottom. For thick specimens, z-stacks were acquired in brightfield or epifluorescence modes and projections generated with the Axiovision Extended Focus module. Images were further processed for color balance or to remove background defects in Adobe Photoshop CS4.