Roestes is a genus of predatory characins from South America, sometimes called pike characins for their elongated, torpedo-shaped body and forward-set jaws lined with pointed teeth - a build convergent with true pikes, adapted for ambushing smaller fish. The atlas's three species, itupiranga, molossus, and Ogilvie's pike characin (R. ogilviei), reach 14 to nearly 8.5 in and are known from river systems in Brazil and Guyana. As active, streamlined piscivores, they occupy a niche broadly similar to the better-known trahiras and other predatory characiforms of the region.
Roestes has little to no established presence in the aquarium trade; what is known of the genus comes mostly from ichthyological survey work rather than hobbyist accounts, and detailed care information for any of the three species is essentially unavailable. One of the three atlas species is rated Vulnerable, with the other two Least Concern - a reminder that even predatory fish sitting near the top of their local food web can carry real conservation exposure from habitat change across Amazonian and Guianan drainages.