Enables glycogen phosphorylase activity. Acts upstream of or within glycogen metabolic process; necroptotic process; and response to bacterium. Predicted to be active in cytoplasm. Is expressed in several structures, including alimentary system; central nervous system; cranium; sensory organ; and urinary system. Used to study glycogen storage disease VI. Human ortholog(s) of this gene implicated in glycogen storage disease; glycogen storage disease VI; and lactic acidosis. Orthologous to human PYGL (glycogen phosphorylase L). [provided by Alliance of Genome Resources, Apr 2022]