Enables inositol-polyphosphate 5-phosphatase activity. Involved in negative regulation of neuron death. Located in dendrite. Is expressed in several structures, including craniocervical region bone; gonad; limb; nervous system; and sensory organ. Orthologous to human INPP5A (inositol polyphosphate-5-phosphatase A). [provided by Alliance of Genome Resources, Apr 2022]