McClory and Gotthardt (2005) provide the following habitat information for this species: “Shallow subtidal and lower intertidal zones, where eelgrass occurs along protected shores, in lagoons and bays on soft substrate, and where kelp beds occur along protected shores as well as exposed rocky points on rocky substrate. Clings to kelp and eelgrass leaf blades; a study of giant kelp in California found H. clarki more abundant within the canopy of kelp fronds than in bottom holdfasts, understory algae or other adjacent habitats (Coyer 1984).” Ricketts et al. (1992) indicate that this species is found in quiet waters where it may be found under rocks and in crevices during the day, and swimming in large numbers at night in among the eelgrass.
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