Predicted to enable heparin binding activity and peptidase inhibitor activity. Predicted to be located in extracellular region. Is expressed in several structures, including axis; chordo neural hinge; fin; hypochord; and mesoderm. Human ortholog(s) of this gene implicated in antiphospholipid syndrome; myocardial infarction; and peripheral vascular disease. Orthologous to human APOH (apolipoprotein H).