Effect of artificial seawater and feeding frequency on the larval culture of freshwater Amazonian ornamental fish banded cichlid Heros severus (Heckel, 1840) and angelfish Pterophyllum scalare (Schultze, 1823)

Bruno J. C. F. Eiras, Galileu C. Veras, Adriana X. Alves, Rauquírio M. da Costa

Abstract


The present study aimed to evaluate the effect of salinity and feeding frequency on zootechnical performance of Pterophyllum scalare and Heros severus five-day-old post-larvae. Two experiments were performed in a completely randomized experimental design in a 5 × 2 factorial scheme, with 5 different NaCl concentrations (0, 2, 4, 6 and 8 g/L) and 2 feeding frequencies (2 and 4 times a day). P. scalare showed the highest survival rates (p<0.05) when subjected to salinities of 0, 2 and 4 g/L (97.50–96.25%), and higher values (p<0.05) for standard length (13.22 mm), weight (64.64 mg) and specific growth rate (15.41% per day) when fed 4 times a day. For this species, feeding frequency did not influence survival rates. H. severus, in turn, showed higher survival rates in water without the addition of salt (96.25%) and the highest standard length in salinity of 2 g/L (11.80 mm). H. severus fed 4 times a day and presented the highest values (p<0.05) for most of the growth variables (weight: 57.28 mg, specific growth rate: 18.30% per day). The results of the present study suggest that banded cichlid post-larvae showed higher survival rates in water without salt addition, however, the best growth of this species occurred at the salinity of 2 g/L. In contrast, angelfish post-larvae can be cultivated in salinities of up to 4 g/LNaCl. A feeding frequency of 4 times per day is recommended for both species.

Keywords


freshwater ornamental fish; larviculture; salt addition; food supply; zootechnical performance

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References


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DOI: 10.5424/sjar/2019172-14645