Abstract
Abstract: The objective of this work was to evaluate a recirculating aquaculture system using biological aerated filters in tanks for tambaqui (Colossoma macropomum) fingerlings farming, with two initial stocking densities (1.4 and 2.5 kg m-3). The biofilters had similar materials (media) and the same granulometric standards, but inverted orders of the media (classic and inverted). The following were monitored for 90 days: water quality; zootechnical, parasitological, and hematological parameters; and hematimetric indices. Water temperature, oxygen levels, pH, electrical conductivity, and dissolved solids concentration were compatible with tambaqui farming and did not differ between the different biofilters and densities. The ammonia and nitrite value was associated with the stocking densities and not with biofilter. The zootechnical and hematological parameters and the hematimetric indices evaluated were not influenced either by the type of biofilter or by the stocking densities. Ichthyophthirius multifiliis, Anacanthorus spathulatus, Notozothecium janauachensis, and Mymarothecium boegeri were the parasites found. The aerated, classical, and inverted biological filters have similar efficiency in maintaining water quality parameters for tambaqui fingerling farming.
Highlights
The tambaqui (Colossoma macropomum Cuvier 1818) is a native fish species from the Amazon River basin
The water quality parameters were similar to that recommended for farming Amazonian fish on traditional fish farming (Oliveira et al, 2007; Chagas et al, 2007; Pereira Júnior et al, 2013)
The results show that both biological filters used were efficient, on controlling the ammonia, nitrite, and total dissolved solid levels
Summary
The tambaqui (Colossoma macropomum Cuvier 1818) is a native fish species from the Amazon River basin. It is farmed in the northern and northeastern regions of Brazil due to its rapid growth, relative resistance to illnesses and good tolerance to high temperatures and moderate levels of dissolved oxygen in the water (Baldisserotto & Gomes, 2010). Tambaqui is cultured with low technological levels in most of Brazil, occurring on extensive and semiintensive systems in earthen ponds. Expanding semi-intensive and intensive system for this fish will lead to increasing volumes of waste nitrogen and solids that foul the water, making it necessary to generate new technologies that can control and reduce effluent pollution to near zero, as observed in recirculation aquaculture systems (RAS)
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