Predicted to enable carbohydrate binding activity; metal ion binding activity; and polypeptide N-acetylgalactosaminyltransferase activity. Predicted to be located in transport vesicle. Predicted to be active in Golgi apparatus. Is expressed in retina layer. Orthologous to human GALNT15 (polypeptide N-acetylgalactosaminyltransferase 15). [provided by Alliance of Genome Resources, Apr 2022]