This experiment compared the effects of five cylindrical aquarium with circular relief in the bottom or a rectangular aquariums with flat bottom on the intensive cultivation of matrinxã larvae (Brycon cephalus). Five aquariums of each format were used and the rectangular aquarium was the most efficient, confirmed by better survival average and biomass. Limnological variables were similar between aquariums, assuming that the parameters did not affect the results. The bottom relief in the aquarium resulted in areas with slow flow velocity, which resulted in the accumulation of waste, predators competitors and aliment, showing negative effects to culture of matrinxã. Rectangular aquariums with flat bottom are more recommended for matrinxã culture, because it provides better water circulation.
cylindrical aquarium; larviculture; particle deposition; rectangular aquarium; relief in the bottom; water circulation
