Do we know what we are conserving? Fishes from Parque Nacional Aconquija, Tucumán, Northwestern Argentina Author Saravia, Alejandro Nicolás Author Mettola, Víctor Ezequiel Author Aguilera, Gastón Author Cano, Paula Daniela Author Terán, Guillermo Enrique text Acta Zoológica Lilloana 2023 2023-12-07 67 2 327 347 http://dx.doi.org/10.30550/j.azl/1804 journal article 299024 10.30550/j.azl/1804 23b81975-ae39-472d-828b-baaac3cb0956 1852-6098 11645144 Odontesthes bonariensis (Valenciennes 1835) Material examined. 6 exemplars; 81.7 - 98.3 mm SL. CI FML 7936 , 6 ex, 27° 16’ 56.04”S 65° 57’ 58.24”W , Tesoro Lagoon . Identification. Less than 60 scales on the lateral line; 11-15 scales on a transversal row; dorsal and anal fins with a spiny unsegmented anterior ray; 2 dorsal fins; dorsal fin at the vertical line that passes through the anus; second dorsal finishes at the same level than the anal fin, or slightly posterior; with horizontal silver stripes on the sides of the body ( Serra et al., 2014 ; Ringuelet et al., 1961 ; Dyer, 2000 ).