Enables glucose:sodium symporter activity. Predicted to be involved in several processes, including alpha-glucoside transport; import across plasma membrane; and transepithelial water transport. Predicted to act upstream of or within glucose transmembrane transport; intestinal absorption; and metanephros development. Located in apical plasma membrane; brush border membrane; and cell-cell junction. Orthologous to human SLC5A1 (solute carrier family 5 member 1). [provided by Alliance of Genome Resources, Apr 2022]