Jenynsia onca Lucinda, Reis & Quevedo, 2002
Jaguar livebearer
Jenynsia onca
photo by Petersen, P.

Family:  Anablepidae (Four-eyed fishes, onesided livebearers & white-eye), subfamily: Anablepinae
Max. size:  5.5 cm SL (male/unsexed)
Environment:  pelagic; freshwater
Distribution:  South America: tributaries of the lower Rio Uruguai in Brazil and Uruguay.
Diagnosis:  Dorsal soft rays (total): 6-9; Anal soft rays: 10-10; Vertebrae: 30-30. Having a large dorsal convex expansion at subdistal segments of right half of sixth anal-fin ray of adult males; distinct ovoid to circular dark spots confined to ventral half of flank posterior to pelvic fins; spots gradually more circular towards midventral line; predorsal scales 13-14; series of dashes or spots on body arranged in 6-8 irregular horizontal lines, consistent midlateral pattern absent; no swelling between the urogenital opening and anterior base of anal fin in females; no distinct dark rounded spot on the dorsal pectoral-fin base (Ref. 42933).
Biology:  Based on photo submitted, this species grow up to 8.0 cm TL and live for up to 7 years in captivity (P. Petersen, pers.comm. 12/2022).
IUCN Red List Status: Least Concern (LC); Date assessed: 27 April 2020 Ref. (130435)
Threat to humans:  harmless
Country info:   
 


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