Enables carnitine O-octanoyltransferase activity. Involved in carnitine metabolic process; coenzyme A metabolic process; and fatty acid metabolic process. Acts upstream of or within fatty acid transport. Located in peroxisome. Is expressed in several structures, including brain; ganglia; gut; liver; and spleen. Orthologous to human CROT (carnitine O-octanoyltransferase). [provided by Alliance of Genome Resources, Apr 2022]