Resumo

BRITO, Diagnora; BRITO, Renato  e  PEREIRA, Guido. Survival of Dendrocephalus spartaenovae (Crustacea: Anostraca: Thamnocephalidae) fed with a microalgae mixed culture. Zootecnia Trop. [online]. 2011, vol.29, n.1, pp.61-68. ISSN 0798-7269.

In the nourishment of the zooplankton several species of microalgae have been in used selected by their size, digestibility of the cellular wall and nutritional value since they influence the survival, growth and metamorphosis of crustaceans larvae. 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/ml. The survival of larvas 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 larvas of D. spartaenovae diminished with the age, reaching a survival of 78,33 % to 6 days of life. The minor mortality of larvas registered was for the population densities from 10 to 20 individuals/100 ml with percentages of 93,75% and 94,79%, respectively. In the anostraceos 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 46,53%. Concerning to the population density, higher values of survival in adults population was 80,79% and 83,33% obtained in densities of 4 and 10 individuals/L, respectively. Females showed higher survival rates than the males with averages of 87,5% and 72,94%, respectively.

Palavras-chave : survival; anostraceos; microalgae.