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Early ontogeny and swimming behavior of larvae of the neotropical fish Prochilodus costatus Valenciennes 1850 and Prochilodus argenteus Spix & Agassiz 1829 (Characiformes: Prochilodontidae)

2016; Vicerractoría Investigación; Volume: 64; Issue: 2 Linguagem: Inglês

10.15517/rbt.v64i2.19052

2215-2075

José Enemir dos Santos, Naiara Guimarães Sales, Marcella L. Santos, Fábio Pereira Arantes, Hugo Pereira Godinho,

Reproductive biology and impacts on aquatic species

The early life story of the curimatas <em>Prochilodus argenteus</em> and <em>Prochilodus costatus</em> was studied from hatching until the complete absorption of the yolk, in order to provide knowledge about its growth and behavior, which can be applied to the development of the larval rearing as well as taxonomic characters. The larvae were obtained from artificial reproduction at Hydrobiology and Aquaculture Station of Três Marias, Minas Gerais. Immediately after the hatching approximately 100 larvae of each species were conditioned in two plastic incubators. Larvae behavior was registered daily and were collected 14 larvae of each species to analyze body morphology. On the first day post-hatching the larvae showed elongated and transparent body. The yolk sac was filled with individualized yolk globules<em>.</em> In both species, the embryonic fin rounded the caudal region of the body, the retina showed depigmented and the gut was obliterated. On the second day, larvae have emerged dendritic chromatophores, the mouth was obliterated and the pectoral fin was recorded<em>. </em>The larvae showed 38-43 myomeres in <em>P. costatus</em> and 42-43 in <em>P. argenteus. </em>The gas bladder was inflated and the lumen of the gut was already open. On the third day, the mouth was already open and in a sub terminal position. Retina was pigmented, the gill arches had lamellar protrusions and were partially covered by the operculum. On the fourth day, the pigmentation pattern was maintained with greater intensity; the mouth occupied terminal position, the yolk sac was almost completely reabsorbed and pectoral and caudal fins showed mesenchymal rays. The gut showed broad lumen with folded mucosa and epithelium with striated border. The larvae of both species showed similar swimming behavior during the trial period.