Enables protein homodimerization activity. Acts upstream of or within protein kinase C signaling; response to dexamethasone; and response to manganese ion. Located in endoplasmic reticulum. Is expressed in several structures, including alimentary system; hemolymphoid system gland; musculoskeletal system; respiratory system; and skin. Orthologous to human FIBIN (fin bud initiation factor homolog). [provided by Alliance of Genome Resources, Apr 2022]