The identity of Yuyu has been interpreted variously by different sources. It is considered a distinct language by Capell (1963), a dialect/tribal name by Berndt and Berndt (1993), and as a cover term for four dialects (Ngawait S10, Erawirung S12, Ngintait S18 and Ngarkat S9) by Walsh (1981).
Various language names have been linked as alternative names for Yuyu: Ngarkat by Dixon (2002), Ngintait by Clark (1996) and Jari Jari S24 by Oates and Oates (1970).
Hope and Hercus 2009 also appear to treat Yuyu and Jari Jari S24 as either the same language or a very closely related dialect, together with Yitha Yitha D7.)
Yuyu is treated as an alternative name for Yirawirung S12 by the Mobile Language Team, and for Ngintait by the Victorian Aboriginal Corporation for Languages.
Wafer and Lissarrage (2008) treat Yuyu as one of three dialects of their 'Upper Riverland language', the other two being Ngintait and Yirawirung.
Horgen (2004) contains some grammatical description of Yuyu.
Along Murray River covering Waikerie, Chowilla, west to Morgan, east to Lake Victoria, and south of Alawoona (Horgen's map 2004). On the Murray River above Paringa (Radcliffe-Brown 1918:247). Erawirung: On the eastern bank of Murray River from above Paringa to Loxton and about 15 miles (40 km.) farther south in sandy country, away from the river. On the western side of river from Rufus Creek west to near Overland Corner (Tindale 1974).
Speaker numbers were measured differently across the censuses and various other sources listed in AUSTLANG. You are encouraged to refer to the sources.
Speaker numbers for ‘NILS 2004’ and ‘2005 estimate’ come from 'Table F.3: Numbers of speakers of Australian Indigenous languages (various surveys)' in 'Appendix F NILS endangerment and absolute number results' in McConvell, Marmion and McNicol 2005, pages 198-230 (PDF, 2.5MB).