Enables stearoyl-CoA 9-desaturase activity. Involved in myelination and response to fatty acid. Predicted to be located in endoplasmic reticulum. Predicted to be active in endoplasmic reticulum membrane. Predicted to be integral component of endoplasmic reticulum membrane. Orthologous to human SCD (stearoyl-CoA desaturase). [provided by Alliance of Genome Resources, Apr 2022]