For this reason, the principal worry of the shrimp-farming industry is to improve its cultivation methods in order to achieve the highest possible levels of productivity per hectare (SANCHEZ, 2003).
Worldwide, there are four methods of producing shrimps: the extensive, semi intensive, intensive and organic cultivation systems.
Therefore, so that shrimp cultivation becomes an economically viable and eco-friendly sustainable activity, some obstacles still need to be overcome, among which the importance of understanding the role of phytoplankton when it comes to food chain.
However, it is not every type of algae that is suitable for cultivation in ponds.
The knowledge of the diversity of the phytoplankton community will benefit both the environment in which it occurs and also the environments in which cultivation is introduced, thus resulting in improvements through phytoplankton knowledge and, by means of this, the knowledge of zooplankton, bacteria related to detritus, hydrophytes, benthos and shrimps and, as a consequence, of all the flux of energy in ponds (BEYRUTH et al.
The objective of this work was to verify the gradient occurrence in the concentration of phytoplankton in the three marine shrimp cultivation systems Litopenaeus vannamei, and the quantification, identification of the main groups of phytoplankton.
Aquamaris" farm, which was represented as F1 farm, is located in the municipality of Joao Pessoa, presented the semi intensive cultivation system, with a density of 15 shrimps [m.