Scientific Name
Astyanax jacobinae
Common Name
Piaba
Biology
Dorsal
spines
(total): 2;
Dorsal
soft rays
(total): 9;
Anal
spines: 4;
Anal
soft rays: 19 - 22. Body compressed, moderately elongate. Mouth terminal. Overall coloration silvery-tan, with silvery highlights on scales, major portion of iris, infraorbitals, preopercle, and opercle. Dorsal portion of iris, together with lateroventral half of head, with the exception of third infraorbital, and ventral portion of preopercle and opercle tinged with yellow. Scales around humeral spot and on lateroventral region of body anterior to anal fin origin also yellowish. Humeral spot visible, although not so conspicuous as in preserved specimens. Concentration of dark chromatophores visible over caudal peduncle, although not forming conspicuous blotch. Dorsal, anal, caudal, and adipose fins reddish-orange. Pectorals yellowish and pelvic fins hyaline.
Astyanax jacobinae can be distinguished from most of its congeners and from all other Astyanax species known from northeastern Brazilian d