Evaluation of the abiotic parameters and characterization of the zooplanktonic community in a pond of cultivation of Litopenaeus vannamei (Boone 1931) in Curuçá, Pará, Brasil

Abstract

This work aimed at to evaluate during a cultivation cycle (97 days) of L. vannamei with biweekly periodicity the community zooplanktonic and the parameters abiotic in two stations inside of a pond in the municipal district of Curuça, Pará. Zooplankton collections were accomplished and measured abiotic parameters: transparency, being pH, dissolved oxygen, salinity and temperature registered in the surface and close to the bottom. They were identified 34 zooplanktonic taxa , being Copepoda the most important group and Acartia lilljeborgi, Euterpina acutifrons, Oithona hebes, O. oswaldocruzi and Parvocalanus crassirostris the species that more they contributed to this dominance. The largest density registered for the zooplankton was of 162.000 org/m3 in the beginning of the cultivation (20/09) and to smallest it was 375 org/m3 on the 05/11. The diversity was also low tends averages of 1,34 bits/ind and 1,10 bits/ind in the stations 01 and 02, respectively. Enter the main conclusions: the copepods were the most abundant group and diversified, could represent an excellent alternative as natural food in the cultivation. In relation to the physics and chemistries variable the ones that had suffered influence from the cultivation, varying significantly throughout the time and that, therefore, deserve constant accompaniment had been: pH, dissolved oxygen and transparency, salinity and temperature if had kept constants and the investigated pond was considered a homogeneous ecosystem evaluating its depth and area.