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Effect of water flow rate and feed training on "pacamã" (Siluriforme: Pseudopimelodidae) juvenile production

2011; UNIVERSIDADE FEDERAL DE MINAS GERAIS; Volume: 63; Issue: 4 Linguagem: Inglês

10.1590/s0102-09352011000400024

1678-4162

Ronald Kennedy Luz, José Cláudio Epaminondas dos Santos, Marcelo Mattos Pedreira, Edgar de Alencar Teixeira,

Fish Ecology and Management Studies

The effects of different water flow rates and feed training on the production of "pacamã" Lophiosilurus alexandri juveniles were evaluated. In the first experiment, nine day post-hatch larvae (n= 2,400) were stocked at a density of 5 larvae/L. Different water flow (F) rates were tested: F1 = 180; F2 = 600; F3 = 1,300; and F4 = 2,600mL/min. Artemia nauplii were offered as food during the first 15 days of active feeding. In the second experiment for feed training, 720 juveniles (total length of 22.2mm) were stocked at a density of 1.5 juveniles/L. A water flow rate similar to F1 was used. The use of extruded dry diet was tested, and feed training was done with and without other enhanced flavors (Artemia nauplii or Scott emulsion). The water flow rates did not influence the survival or growth of L. alexandri. Cannibalism occurred during feed training. The worst survival, specific growth rate and high mortality were found with the use of extruded dry diet, while similar values were registered with the different feed training diets used. Reduced water flow rate can be used to lower water consumption during larviculture and feed training of L. alexandri.