About Apodichthys flavidus Girard, 1854
Apodichthys flavidus, commonly called the penpoint gunnel, varies in coloration, with individuals ranging in color from green to maroon or brown. This species reaches a maximum published total length of up to 46 centimeters (18 inches). It is most easily identified by the dark bar located below each eye, a feature often visible when the fish peeks out from a kelp bed or crevice. A row of dark and/or pale spots runs along its midbody, and there is commonly a series of short, pale bar-shaped markings that extend downward from the top of its dorsal fin. The first spine of its anal fin is large and grooved, shaped like the point of a fountain pen. It has continuous dorsal, caudal (tail), and anal fins, but lacks ventral fins. The tail fin is distinguished by slightly longer fin rays. The anal fin is approximately half the length of the dorsal fin. This is an elongated fish, with long-based, low dorsal and anal fins. The dorsal fin contains between 40 and 44 spines, while the anal fin has one spine and between 38 and 42 soft rays. The caudal fin is rounded, and the pectoral fins are small and rounded. The penpoint gunnel is found mainly in intertidal habitats at depths between 0 and 1.8 meters (0.0 to 5.9 feet). Geographically, its distribution extends along the Pacific coast of North America, from Kodiak Island in the Gulf of Alaska to Santa Barbara Island in southern California. It can sometimes be observed in tide pools, as well as in eelgrass beds, sea lettuce beds, and kelp stands. It commonly matches the color of the vegetation it inhabits. When no vegetation is available, for example during winter, it can also occupy rocky areas, hiding under rocks and within protective crevices. It can even stay out of water beneath rocks or seaweed, and is able to breathe air while out of water.
