Predicted to enable identical protein binding activity and water channel activity. Acts upstream of or within camera-type eye morphogenesis; saliva secretion; and water transport. Located in several cellular components, including apical plasma membrane; basal plasma membrane; and microvillus. Is expressed in early conceptus; lung; olfactory epithelium; oocyte; and salivary gland. Human ortholog(s) of this gene implicated in Bothnian type palmoplantar keratoderma. Orthologous to human AQP5 (aquaporin 5). [provided by Alliance of Genome Resources, Apr 2022]