This area holds the regular presence of the Orinoco Discus Stingray as a resident range-restricted species. This species was only described in 2021 (Loboda et al. 2021) and its occurrence has been reported in only three studies (Muñoz-Osorio & Mejía-Falla 2013; Lasso et al. 2016; Loboda et al. 2021).

A pregnant Orinoco Discus Stingray was captured in March 2009 in this area (Muñoz-Osorio & Mejía-Falla 2013; Torres et al. submitted b). Between 2013–2014, another study examined 22 Orinoco Discus Stingrays, in which 16 (72%) were collected in this area with the other individuals recorded in the lower section of the Orinoco River (~700 km apart from this area) and upper section of Rio Apure (~250 km apart from this area) (Loboda et al. 2021). The individuals from this area measured 17.4–38.2 cm disc width (DW). Between 2011–2016, surveys were carried out during the dry season, in tributary rivers of the Colombian Orinoquia, at seven sampling points characterised by three different types of waters (i.e., clear, white, and black waters) (Lasso et al. 2016). Orinoco Discus Stingrays were captured using a variety of methods and fishing gears (daytime freediving, nighttime boat trips, shore-based fishing; using longlines, harpoon, hand nets) (Lasso et al. 2016). All Orinoco Discus Stingrays collected (reported as Paratrygon sp. 1) were from this area (females = 15, males = 5) measuring between 17.7–80 cm DW. The size-at-birth of this species is estimated to be ~23–24 cm DW (Torres et al. submitted b), with maturity size for females estimated at 45 cm DW and 40 cm DW for males (Loboda et al. 2021). Therefore, this area provides an important area for different life-stages of this species. Orinoco Discus Stingray is endemic to the Orinoco Basin in Colombia and Venezuela (Torres et al. submitted b). It occurs in the mid-section of the Apure River, Bita River, and mid to lower section of the Orinoco River, downstream to its delta (Loboda et al. 2021).