Enables actin filament binding activity. Involved in cell migration and positive regulation of filopodium assembly. Acts upstream of or within actin filament bundle assembly. Located in filopodium; growth cone; and lamellipodium. Is expressed in several structures, including alimentary system; central nervous system; embryo mesenchyme; genitourinary system; and sensory organ. Orthologous to human FSCN1 (fascin actin-bundling protein 1). [provided by Alliance of Genome Resources, Apr 2022]