Author: Dagosta, Seren, Ferreira & Marinho, 2022
FBname: Emerald green tetra
Comments: Collection areas are impoundments of tributaries of the rio Mutum formed by the road building, where the water is transparent, with maximum widths ranging 50-60 m and depth 0.3-2 m. The substrate is formed by sand, silt, and organic matter, with the presence of submerged aquatic macrophytes and large amounts of filamentous algae. The only other species collected syntopically was <i>Hoplerythrinus unitaeniatus</i> (Spix & Agassiz, 1829), which is probably a predator of the <i>H. comodoro</i>. The streams that form the lagoons are small, 2-4 m wide and 0.5-2 m deep, with clear rapid waters and a bottom composed of sand and leaf litter. Local vegetation is composed of secondary forest. The other known locality lies at the rio Mutum itself, downstream to the other two and here the new species occurs syntopically with <i>Hyphessobrycon hexastichos</i> and <i>Hasemania nambiquara</i>. The diet was mainly composed of resources autochthonous (91.6% of the volume of food items), mainly vegetable fragments (57.7%) and aquatic insects (32.7%). The vegetable fragments were composed of aquatic macrophyte structures and the aquatic insects were fragments of adults, larvae, and pupae of Diptera and larvae of Trichoptera, and Odonata). Specimens analyzed were collected in a region under moderate anthropogenic pressure, which may influence the diet of fish species. Further, damming streams to road building changes the taxonomic and functional of fish assemblages and limits the longitudinal dispersion. The transformation from lotic to lentic environments, with an increase in the width of the canopy-opening channel, creates pelagic and benthic areas that allow the proliferation of macrophytes and algae. Biological data taken from regions impacted by human action has high scientific value, but in the case of this species, it is crucial that the data also be available from less impacted environments (Ref. 128640).