Enables prostaglandin-D synthase activity and retinoid binding activity. Involved in prostaglandin biosynthetic process and regulation of circadian sleep/wake cycle, sleep. Acts upstream of or within negative regulation of male germ cell proliferation. Located in extracellular region. Is expressed in several structures, including alimentary system; genitourinary system; integumental system; nervous system; and sensory organ. Human ortholog(s) of this gene implicated in carotid artery disease. Orthologous to human PTGDS (prostaglandin D2 synthase). [provided by Alliance of Genome Resources, Apr 2022]