This paper explores the interconnectedness of natural history collections with hidden Indigenous taxonomies through a collection of fish that are held in the Zoology Department in the National Museum of Scotland, and a related dispersed archival collection at the Natural History Museum in London. 67 fish were collected in 1841 by Robert Neill, a Commissariat Officer in the town of Albany (WA), but most of the fish were caught by Menang Nyungar fishermen, using spears or trapping fish in their weirs. Prioritising Menang contemporary and historical fish knowledge, this collaborative project brings together ichthyologists, fish curators, historians and Menang knowledge holders to unpack the fish collection together across these epistemologies. In this presentation we discuss our methods of working together and reveal the significant contemporary importance of this natural history collection, currently held in obscurity within western scientific taxonomic discourse, divorced from the colonial historical context which generated its acquisition, and the Indigenous community whose knowledge it captures.