Aruka

Copella carsevennensis is a small lebiasinid from coastal river systems in Guyana, Suriname, French Guiana and Amapá state, Brazil. It appears in the trade from time to time among wild-caught fishes from the Guianas. Zarske (2011) separated it from C. arnoldi, partly because it lays its eggs among submerged vegetation and not out of the water, though Mol (2012) considers the two synonymous.

The sailfin characin, Crenuchus spilurus, is a crenuchid from much of the Amazon and Orinoco drainages and coastal rivers of the Guianas. The only described member of its genus, it varies considerably in colour pattern and morphology across that range. It lives in tea-stained forest streams, and its timid, predominantly benthic nature means it does not always make an ideal community fish. Males guard eggs laid on the roof of a small cave, often formed from leaf litter.