Enables glycerophosphocholine phosphodiesterase activity. Involved in negative regulation of Notch signaling pathway and positive regulation of cell cycle. Acts upstream of or within neuron differentiation; positive regulation of neuron differentiation; and regulation of timing of cell differentiation. Located in several cellular components, including axon; neuronal cell body; and perinuclear endoplasmic reticulum. Is expressed in several structures, including nervous system and neural retina. Orthologous to human GDPD5 (glycerophosphodiester phosphodiesterase domain containing 5). [provided by Alliance of Genome Resources, Apr 2022]