Enables all-trans-retinol 13,14-reductase activity. Involved in retinol metabolic process. Located in endoplasmic reticulum membrane and nuclear outer membrane. Is expressed in several structures, including adipose tissue; alimentary system; genitourinary system; hemolymphoid system gland; and nervous system. Orthologous to human RETSAT (retinol saturase). [provided by Alliance of Genome Resources, Apr 2022]