The zebrafish lateral line system is an excellent model system to investigate tissue development, as well as tissue regeneration. The lateral line system is composed of external sensory organs called neuromasts that are located on the head and trunk of the fish. Each neuromast has centrally located mechanosensory hair cells that are surrounded by non-sensory support cells. These hair cells are structurally and functionally similar to the hair cells located within mammalian ears that detect fluid fluctuations caused by sound. However, unlike their mammalian counterparts, zebrafish are able to replace lost hair cells by symmetric divisions of underlying support cells. Our lab has previously shown that adult zebrafish replace hair cells and support cells after multiple ototoxin-induced hair cell deaths. Currently, the mechanism preserving hair cells and support cells during regeneration and development is unknown. Using the Zebrabow transgenic line, we are able to permanently and mosaically label different support cell populations to perform lineage tracing of support cells under different conditions. We observe that neuromasts, initially of a multicolored support cell arrangement, drift towards clonality over an extended period of time. This suggests that neuromasts are maintained by a small long-lived population of progenitor support cells to produce all the support cells in the neuromast.