Navegando por Autor "Santos, Jorge Luiz da Silva"

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Efeito de densidades de estocagem na disponibilidade de alimento natural em berçário de camarão Litopenaeus vannamei (Boone, 1931) cultivado com tecnologia de biofloco
(2018) Santos, Jorge Luiz da Silva; Silva, Ugo Lima; http://lattes.cnpq.br/1858876631961029; http://lattes.cnpq.br/3650685131155739
The objective of this work was to determine the main components of planktonic food in the nursery of shrimp L. vannameiwith biofloc technology. The experiment was carried out for 28 days and a randomized design with three post-larval storage densities, D2: 2 PLs. L-1, D4: 4 PLs. L-1and D6: 6 PLs.L-1, with four replicates each, using molasses as carbon source, in the C: N ratio of 15: 1. Samples were collected weekly, with 2 liters of water in each tank, which were filtered with plankton net and concentrated in 250 mL. The qualitative and quantitative study of plankton with 1 mL sub-samples for zooplankton was carried out in the Sedgwick-Rafter chamber (ind.L-1). The phytoplankton was evaluated in slides and coverslips (nº cells.mL-1) analyzing 0,1 mL, bothunder light microscope. The temperature values remained close to 22 ° C, below the ideal temperature for L. vannameicultivation, since the appropriate range for this species is between 26 to 33ºC, but the dissolved oxygen was in the ideal conditions for its culture, which should be above 4.0 mg.L-1and during the experiment remained above 8 mg.L-1. The development of shrimp did not show any difference between the treatments, for the final weight variable, since the survival, the D2treatment obtained the highest survival (> 72%) and the production in D6was higher than in the other treatments (2.98 Pls.L-1). The zooplankton community in the nursery tanks was represented by 23 genera, distributed among the groups Rotifera, Protozoa, Nematoda, Platelmintos and Cladocera. The Protozoa group presented the most diversification, regardless of the treatment, and also presented the highest abundance (> 66%). The main genera of Protozoa were Aspidisca, Euplotesand Trinema, and the phytoplankton community was composed of 16 genera, distributed in the classes Chlorophyceae, Bacillariophyta, Cyanophyceaeand Dinophyceae, the dominant class was Bacillariophyta(> 41%), with the genera Naviculaand Cyclotella. The density of 4 PL.L-1gave the highest density of zooplankton, but for the phytoplankton the density of 6 PLs.L-1was the one with the highest amount.
Produção de alevinos de tilapia do nilo Oreochromis niloticus (Linnaeus, 1758) na empresa AAT International, Paulo Afonso, BA
(2018) Santos, Jorge Luiz da Silva; Silva, Ugo Lima; http://lattes.cnpq.br/1858876631961029; http://lattes.cnpq.br/3650685131155739
Aquaculture is the fastest growing food industry in the world. With a production in Brazil of 562,500 tons in 2014, being the 14th largest producer in the world. The objective of this work was to identify the necessary infrastructure for the production of tilapia from AAT international Ltda, located in the city of Paulo Afonso, Bahia, the company is focused on the production of tilapia juveniles and juveniles. The stage took place from October 15 to December 26, 2018, during which time it was possible to follow the routines and the necessary infrastructure for aquaculture production, thus handling during the whole production phase, from the collection of eggs, asepsisof eggscollection, transfers to the various sectors that the company has, methods of classification, control of diseases and medicines and strategies used during cultivation. The experiences and knowledge acquired during the internship gave me a professional maturity and a better understanding of the theoretical knowledge applied in practice.