Predicted to enable sialic acid transmembrane transporter activity. Predicted to be involved in sialic acid transport. Predicted to act upstream of or within transmembrane transport. Predicted to be located in membrane. Predicted to be active in apical plasma membrane and lysosome. Is expressed in several structures, including axis; cardiovascular system; hatching gland; polster; and yolk syncytial layer. Human ortholog(s) of this gene implicated in sialuria. Orthologous to human SLC17A5 (solute carrier family 17 member 5).