Resumo

BRITO, Diagnora; BRITO, Renato; PEREIRA, Guido  e  GUEVARA, Miguel. Effect of population density and age on survival of Dendrocephalus spartaenovae fed microalgae (Chlorella vulgaris). Zootecnia Trop. [online]. 2014, vol.32, n.2, pp.101-108. ISSN 0798-7269.

Bioassays were conducted in the laboratory to assess the use of the natural resource, Dendrocephalus spartaenovae, as alternative source of live food in aquaculture. The purpose of this research was to determine the survival of Dendrocephalus spartaenovae from 1 to 6 and from 6 of 32 days of age in different conditions of culturing and fed to a concentration of 5 *105 cells Chlorella vulgaris/ml. The survival of larva was evaluated of D. spartaenovae from 1 to 6 days of life considering the age and population density. The survival of the organisms from 6 to 32 days of life, it measured up in relation to the age, population density and sexual condition. The survival of larva of D. spartaenovae diminished with the age, reaching a survival of 63.13% to 6 days of life. The minor mortality of larva registered was for the population densities from 10 to 20 individuals/100 ml with percentages of 84.58% and 88.5%, respectively. In the anostráceos from 6 to 32 days of life; the survival diminished according to the age of individuals, the lowest rate of survival was found at 32 days with 18.81%. Concerning to the population density, the higher values of survival in adults was 64.37% obtained in densities of 4 individuals/l. Females showed higher survival rates than the males with averages of 63.13% and 52.36%, respectively.

Palavras-chave : Anostraca; microalgae; live food; bioassay; aquaculture.

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