COMPOSIÇÃO, DENSIDADE E BIOMASSA DO ZOOPLÂNCTON EM VIVEIROS DE CULTIVO DO CAMARÃO BRANCO Litopenaeus vannamei NO SUL DO BRASIL.
Litopenaeus vannamei is the most cultivated shrimp species in Brazil, being fed basically on high protein formulated diets. However some studies have shown that the natural zooplankton found in shrimp ponds can be part of the diet of this crustacean. In this study the zooplankton composition, density and biomass were evaluated for two shrimp ponds in a shrimp farm in Southern Brazil. Samples from the two ponds were taken throughout three consecutive months using a zooplankton net of 150 cm total length, 30 cm mouth diameter and 140 ?m nylon mesh size. All the zooplankton samples were preserved in formaldehyde solution at a final concentration of 4% and transported to the laboratory, were the composition, density and biomass (wet and dry weight) were assessed. Copepoda and Cladocera were the most frequent groups, while the most abundant species were Acartia tonsa, Pseudodiaptomus richardi and Moina micrura, species commonly found in the Patos Lagoon Estuary. The density values were higher than those ones usually recorded for the estuary during periods of maximum production, reaching 278 org.L-1 in 11/18/2005 (pond 1), and 277 org.L-1 in 12/08/2005 (pond 2), suggesting that the zooplankton, can grow well in the shrimp ponds. The values of wet weight and dry weight were relatively high ranging from 0,15 to 13,28 g.m-3 (wet weight) and 0,01 to 2,72 g.m-3 (dry weight) during the experimental period, following the same pattern presented for the density. These results indicate that the natural zooplankton occurring in the shrimp pounds represents a potential food source for the shrimp larvae and juveniles in the first months of culture.
Advisor:Charrid Resgalla Junior; Ronaldo Olivera Cavalli; José Guilherme Bersano Filho
School:Fundação Universidade Federal do Rio Grande
Source Type:Master's Thesis
Date of Publication:02/09/2007