Bryconops cyrtogaster is a midsize species of freshwater fish found in the Oyapock river in French Guiana and Brazil.

Bryconops cyrtogaster is about 12 cm (4.7 in) in total length,[1] which makes it slightly longer than the average member of its genus.

[5] Until 2020, Bryconops cyrtogaster was generally poorly studied, but received a redescription by Silva-Oliveira et al. in June of that year.

[10] Though its taxonomy has since been studied more closely and subsequently changed, Norman's original placement for Bryconops cyrtogaster retains an element of validity.

[13] Some sources, such as Animal Diversity Web and ITIS, still list it under Characidae,[14][15] but the current accepted standing of Bryconops cyrtogaster is as an Iguanodectid fish.

[1] The Oyapock river is not the subject of extensive development, but has a history of gold mining, which raises the amount of pollutants - specifically mercury - in the water.