Enables phosphatidylinositol-3,4,5-trisphosphate 5-phosphatase activity. Acts upstream of or within negative regulation of neuron projection development and negative regulation of peptidyl-serine phosphorylation. Located in dendritic shaft; growth cone; and plasma membrane. Is expressed in alimentary system; ear; nervous system; respiratory system; and skeleton. Orthologous to human INPP5J (inositol polyphosphate-5-phosphatase J). [provided by Alliance of Genome Resources, Apr 2022]