Percichthys trucha (Cuvier & Valenciennes, 1840)

Soricetti, Mariano, Morawicki, Santiago, Guardiola Rivas, Fredy José, Guidi, Catalina, Quezada, Facundo, Almirón, Adriana Edith & Solimano, Patricio José, 2020, Ichthyofauna of the lower course of the Negro river drainage, Patagonia Argentina, Check List 16 (4), pp. 895-905 : 902

Percichthys trucha (Cuvier & Valenciennes, 1840) Figure 3J

Material examined. ARGENTINA • 1 ♂, 272 mm; Site 1; 40°26ʹ18ʺS, 063°40ʹ54ʺW; 21 Jan. 2016; M. Sorice- tti leg.; MPCN-Ict 10 . • 1 ♂, 61 mm; Site 1; 40°26ʹ18ʺS, 063°40ʹ54ʺW; 21 Jan. 2016; M. Soricetti, F. Guardiola Ri- vas leg.; MPCN-Ict 67 . • 1 ♀, 66 mm; Site 1; 40°26ʹ18ʺS, 063°40ʹ54ʺW; 21 Jan. 2016; M. Soricetti, F. Guardiola Ri- vas leg.; MPCN-Ict 68 . • 1 ♀, 69 mm; Site 1; 40°26ʹ18ʺS, 063°40ʹ54ʺW; 21 Jan. 2016; M. Soricetti, F. Guardiola Ri- vas leg.; MPCN-Ict 69 . • 1 ♂, 71 mm; Site 4; 40°43ʹ15ʺS, 063°36ʹ02ʺW; 20 Feb. 2016; M. Soricetti, F. Guardiola Ri- vas leg.; MPCN-Ict 70 . • 1 ♀, 78 mm; Site 1; 40°26ʹ18ʺS, 063°40ʹ54ʺW; 21 Jan. 2016; M. Soricetti, F. Guardiola Ri- vas leg.; MPCN-Ict 71 . • 1 ♀, 95 mm; Site 4; 40°43ʹ15ʺS, 063°36ʹ02ʺW; 20 Feb. 2016; M. Soricetti, F. Guardiola Ri- vas leg.; MPCN-Ict 72 . • 1 ♂, 102 mm; Site 1; 40°26ʹ18ʺS, 063°40ʹ54ʺW; 21 Jan. 2016; M. Soricetti, F. Guardiola Ri- vas leg.; MPCN-Ict 73 . • 1 ♀, 142 mm; Site 4; 40°43ʹ15ʺS, 063°36ʹ02ʺW; 20 Feb. 2016; M. Soricetti, F. Guardiola Ri- vas leg.; MPCN-Ict 74 .

Identification. Body elongated and relatively compressed. Head length about three times of the body length. Mouth not very large, with the jaw included, which does not protrude above; maxilla relatively small, fitting 2.5 to 3 times into the head length, its posterior edge reaches the anterior edge of the eye. Wide interor- bital space. Dorsal fin with 9–11 spines and 12 or 13 soft rays, the spiny and soft portions separated by a V-shaped notch. Small opercular spines; scapular process little robust. Anal fin with three spines and 9 or 10 soft rays. Its origin coincides with the end of the spinous portion of the dorsal fin. The color of live specimens is pale gold or lemon, up to golden olive, the belly is pale violet and the back may have olive shades to gray green or slate blue. All the scales have blue-black spots. Back of the head violaceous–brownish, and the operculum reddish. Dorsal fin light violet with brown spots and the caudal fin violet lemon with small dark specks.