Enables L-amino acid transmembrane transporter activity and neutral amino acid:sodium symporter activity. Involved in L-alpha-amino acid transmembrane transport; female pregnancy; and neutral amino acid transport. Located in external side of apical plasma membrane and neuronal cell body. Biomarker of visual epilepsy. Orthologous to human SLC38A1 (solute carrier family 38 member 1). [provided by Alliance of Genome Resources, Apr 2022]