Desempenho na eclosão de cistos de crustáceo Dendrocephalus brasiliensis

Abstract

Abstract: In order to produce live food for aquaculture, it is necessary to use species with certain characteristics such as high protein content, biomass production, rusticity; in this context, we can mention the crustacean Dendrocephalus brasiliensis that meets these characteristics. But to guarantee the high productivity it is necessary to develop studies to determine the best conditions for the cultivation of the specie. The objective of this work was to evaluate the performance of D. brasiliensis cysts in different conditions aiming to generate technologies that improve the performance of production of the specie. To perform the tests, we placed the cysts in glass tubes, in a total of 10 cysts/tube. Each treatment consisted of 30 cysts divided in 3 replicates, in a total of 15 treatments. The treatments varied in pH and temperature, being 5 pH (3, 4, 7, 8 and 9) and 3 temperature variations, the tubes containing the different treatments were arranged in 3 recipients wrapped in aluminum foil to avoid luminosity, one was placed in an environment with constant temperature (20 °C), another was placed in beaker with thermostat (25 °C) and the third in BOD (30 °C). In general the specie has low efficiency in hatching, but our results showed hatch rate lower than 1.5%, and despite the variations in the conditions there was no statistical difference between the treatments. We conclude that the conditions tested are not ideal for the hatching of the D. brasiliensis, and that further testing is required.