Navegando por Autor "Olivera Gálvez, Alfredo"

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Aquicultura vai à escola parte II – uma extensão prática da aquicultura em Itapissuma-PE
(2021-02-05) Santos Filho, Fernando Sebastião dos; Olivera Gálvez, Alfredo; Santos, Elizabeth Pereira dos; http://lattes.cnpq.br/5362345525199085; http://lattes.cnpq.br/7002327312102794; http://lattes.cnpq.br/1445666896933448
Due to the stagnation of fishing activity in recent years, aquaculture has emerged as an alternative to supply the demand for fish worldwide; with this, this type of production of food and biotechnological products has been growing significantly to meet the needs of the entire world population. According to FAO, aquaculture is the culture under control of aquatic animals and plants. Among the branches of aquaculture, we have: Pisciculture (Fish cultivation), Malacoculture (Mollusk cultivation), Shrimp farming (Crustacean cultivation) and Algiculture (Algae cultivation). In this study, the extension worker, together with undergraduate and graduate students linked to the Department of Fisheries and Aquaculture at the Federal Rural University of Pernambuco, went to the high school reference school (EREM) Eurídice Cadaval in Itapissuma - PE in order to establish an exchange of learning with regard to aquaculture, publicizing the activities linked to the baccalaureate course in fisheries engineering, which is currently not widespread in society, in addition to the performance of this professional in the area related to the productive sectors of the Itapissuma region (fish, crustaceans , mollusks and algae). The work was carried out through dynamic, practical and theoretical classes, given to high school students. In these classes, social, cultural and environmental topics were approached from the highlight of the problems that surround the daily life of the community, thus helping in the development of these students as citizens, opinion makers and future professionals who can work with the community they live.
Avaliação do crescimento e rendimento em biomassa das diatomáceas Amphora sp., Chaetoceros calcitrans e Thalassiosira fluviatilis
(2020-10-29) Lima, Jasiel José de; Olivera Gálvez, Alfredo; Moraes, Laenne Barbara Silva de; http://lattes.cnpq.br/1483699193923171; http://lattes.cnpq.br/7002327312102794; http://lattes.cnpq.br/0975356390769917
Microalgae are autotrophic microscopic organisms that form a heterogeneous group, predominant in aquatic environments, responsible for most of the oxygen and primary production of the Earth. They are classified into four main groups: Cyanophyceae, Chrysophyceae, Chlorophyceae and Bacillariophyceae (diatoms). These microorganisms produce various organic compounds and are commonly used in several branches of industry and aquaculture. The present study aimed to evaluate the growth and yield in dry biomass of the diatoms: Amphora sp., Chaetoceros calcitrans and Thalassiosira fluviatilis. The experimental design was completely randomized, with three replications for each species, totalling nine experimental units. For growth evaluation, daily counts were performed in a Neubauer chamber and optical microscope, obtaining the variables: growth rate (K), doubling time (DT) and maximum cell density (MCD). Likewise, growth curves were drawn up adjusted by approximating the logistic curve. At the end of the cultivation, the dry biomass yield was obtained, after the centrifugation steps, to remove the supernatant and lyophilization, to dry the biomass. As a result, higher DCM and K were obtained for C. calcitrans (1,225 x 104 cells mL-1 and 1.58 div day-1) and higher dry biomass yields for T. fluviatilis (0.61 g L-1) and Amphora sp. (0.46 g L-1). The three species showed different parameters of growth and yield in biomass, being T. fluviatilis and Amphora sp. favorable for yield in dry biomass and C. calcitrans to reach higher cell densities.
Avaliação do uso de náuplios de Artemia salina em conserva no cultivo larval do camarão marinho Litopenaeus vannamei
(2021-01-12) Gonçalves Junior, Genes Fernando; Olivera Gálvez, Alfredo; Santos, Rudã Fernandes Brandão; http://lattes.cnpq.br/8215221992184585; http://lattes.cnpq.br/7002327312102794; http://lattes.cnpq.br/3782063270079532
In view of the high demand for brine shrimp larvae in marine shrimp larviculture, due to nutritional richness and practicality in management, several studies have focused efforts on techniques to preserve their biomass, since microcrustaceans are highly subject to decomposition. This study aimed to evaluate the use of canned Artemia salina nauplii in the larval cultivation of Litopenaeus vannamei. An experiment was carried out then a validation in commercial larviculture, Maris Laboratório - CE, both lasting 5 days. The first in 10 L buckets with 2 treatments (AN = fresh brine and AC = preserved brine) and 4 replicates. The validation in 25 m³ tanks, with the same treatments, but without repetitions. The larvae were accompanied by misis 1 to PL2 and evaluated by means of the following analyzes: bacteriological being performed at the beginning, middle and end of the experiment; water quality every day with the parameters of temperature, salinity, pH, ammonia and nitrite; finally, the zootechnical performance through the evaluation of larval quality, larval development index, survival, length and TBI. The data were submitted to ANOVA by the Tukey test for normally distributed data, the differences were reported when (P <0.05). The results were within the recommended standards for the species and there were no significant differences in the evaluations between treatments in any of the experiments. For future work, it is recommended to evaluate the economic viability of the product. Thus, it is possible to replace the nauplii of A. salina in natura by the one conserved in the larval cultivation of L. vannamei, since the test treatment did not alter the evaluated indexes.
Cultivo multitrófico do camarão marinho (Litopenaeus vannamei) em sistema bioflocos com macroalga (Gracilaria domingensis) e duas dietas comercias
(2019-07-04) Oliveira, Deyvid Willame Silva; Olivera Gálvez, Alfredo; Santos, Elizabeth Pereira dos; http://lattes.cnpq.br/5362345525199085; http://lattes.cnpq.br/7002327312102794; http://lattes.cnpq.br/4224003240625541
Desempenho da Daphnia magna (Straus, 1820) cultivada em efluente de Tilápia do Nilo cultivada em sistema de bioflocos com diferentes relações C:N
(2019) Bruzaca, David Nunes Aguiar; Olivera Gálvez, Alfredo; http://lattes.cnpq.br/7002327312102794; http://lattes.cnpq.br/8145992758069560
In aquaculture, systems with minimum water exchange are an alternative to sustainable farming. Biofloc technology (BFT), which consists of the formation of microbial aggregates through the manipulation of the carbon: nitrogen ratio of the culture medium is an option in reducing the emission of effluents. However, the accumulation of nitrogen and phosphate residues over several crop cycles in this system ends up causing significant impacts with the release of effluent into the environment. Therefore, Daphnia magna, which is a microcrustacean of the cladoceran family that benefits from the organic mater present in the aquatic environment, can be used for the bioremediation of this effluent. The cultivation of this microcrustacean is traditionally carried out in a clear water system with the addition of the microalgae Chlorella vulgaris in its diet. In this way, the present work aims to evaluate the performance of D. magna cultivated in effluent waters of the BFT system in different carbohydrate: nitrogen ratios with the inoculation of C. vulgaris microalgae and fish feed supplementation. The experimentation is done with six treatments in triaplicates based on two factors, being : Ratio C: N (10: 1, 15: 1 e 20: 1) and Feed (with addition of fish feed (R) or without addition of fish feed (SR)). The variables of water quality: temperature (°C), dissolved oxygen (mg.L-1), salinity (gL-1), pH, NO2 (mg.L-1), TAN (mg.L-1), hardness and alkalinity were measured throughout the culture. The specific growth rate (TCE), doubling time (TD), maximum mean density (DMX), yield (R) and day of maximum density (DMD) were verified for the growth variables. To the variables pH, temperature, Salinity, TAN, Nitrite and Hardness there were no significant differences (p> 0.05) throughout the culture. Regarding dissolved oxygen there was a significant difference for the ration factor and for the interaction between the ration and feed factors. There was also a significant difference when the alkalinity was treated for the ration factor, the feed factor and for the interaction between them, with an average of 50.93 and 80.37. The pH, dissolved oxygen and temperature were favorable for the proper development of the cladoceran. Although there were statistical differences only for the ration factor, the DMXs were between 1001 ± 283 and 3433 ± 267 org.L-1. The days of maximum density were 12º, 14º and 18º days. The 10SR treatment provided a higher average maximum density of Daphnia magna on the 14th day of cultivation, besides showing TCE, TD and R values higher than the other treatments. However, all treatments allowed the growth of the cladoceran, proving that the use of the effluent is an alternative to the production of live food.
Microalgas do Semiárido: florações nocivas, variabilidade sazonal e suas possíveis aplicações biotecnológicas
(2018) Oliveira, Carlos Yure Barbosa de; Dantas, Danielli Matias de Macêdo; Olivera Gálvez, Alfredo; http://lattes.cnpq.br/7002327312102794; http://lattes.cnpq.br/3422902414863662; http://lattes.cnpq.br/3825860944561089
Microalgae and cyanobacteria are eukaryotes and prokaryotes, respectively, photosynthetic and use atmospheric CO2, light and inorganic compounds for their growth. In addition, they produce nutritional, bioactive compounds and some species mayproduce toxins (like some species of cyanobacteria and dinoflagellates). The present study aimed to identify and isolate species from the phytoplankton community of reservoirs located in the semiarid Pernambucano and later to evaluate the biotechnological potential of microorganisms previously isolated from the center of cultureof the Laboratório de Produção de Alimento Vivo (LAPVI-UFRPE/Sede). For the collection of these organisms a network with a mesh of 20μm was used, being part of the collected material fixed in formaldehyde to 4% and the rest submitted to the culture. After the sorting of all collected material, the canonical correspondence analysis was performed to evaluate possible interactions between the abiotic parameters and the species found. The evaluation of biotechnological potential occurred by the bioremediation capacity test of Chlorella vulgarisin effluent from a biofloc system (BFT). Twenty-one taxa were recorded, most of them of the class Chlorophyceae. Among the species found, we highlight the presence of Ceratium furcoides, an exotic dinoflagellate that is found in a growing geographic expansion in Brazil. In the evaluation of bioremediation potential, the presence of Chlorella vulgaris promoted a reduction in the levels of nitrogenous and phosphate compounds of the BFT effluent of approximately, 79.2% and 48%, respectively. In addition to the removal capacity of these compounds, BFT effluent presented as potential medium for the cultivation of this microalgae.
Microalgas do semiárido: florações nocivas, variabilidade sazonal e suas possíveis aplicações biotecnológicas
(2018-09-23) Oliveira, Carlos Yure Barbosa de; Dantas, Danielli Matias de Macêdo; Olivera Gálvez, Alfredo; http://lattes.cnpq.br/7002327312102794; http://lattes.cnpq.br/3422902414863662; http://lattes.cnpq.br/3825860944561089
Microalgae and cyanobacteria are eukaryotes and prokaryotes, respectively, photosynthetic and use atmospheric CO2, light and inorganic compounds for their growth. In addition, they produce nutritional, bioactive compounds and some species may produce toxins (like some species of cyanobacteria and dinoflagellates). The present study aimed to identify and isolate species from the phytoplankton community of reservoirs located in the semiarid Pernambucano and later to evaluate the biotechnological potential of microorganisms previously isolated from the center of culture of the Laboratório de Produção de Alimento Vivo (LAPVI-UFRPE/Sede). For the collection of these organisms a network with a mesh of 20μm was used, being part of the collected material fixed in formaldehyde to 4% and the rest submitted to the culture. After the sorting of all collected material, the canonical correspondence analysis was performed to evaluate possible interactions between the abiotic parameters and the species found. The evaluation of biotechnological potential occurred by the bioremediation capacity test of Chlorella vulgaris in effluent from a biofloc system (BFT). Twenty-one taxa were recorded, most of them of the class Chlorophyceae. Among the species found, we highlight the presence of Ceratium furcoides, an exotic dinoflagellate that is found in a growing geographic expansion in Brazil. In the evaluation of bioremediation potential, the presence of Chlorella vulgaris promoted a reduction in the levels of nitrogenous and phosphate compounds of the BFT effluent of approximately, 79.2% and 48%, respectively. In addition to the removal capacity of these compounds, BFT effluent presented as potential medium for the cultivation of this microalgae.
Produção de astaxantina a partir da microalga Haematococcus pluvialis: processos, aplicações e mercado
(2021-01-12) Mota, Géssica Cavalcanti Pereira; Olivera Gálvez, Alfredo; Moraes, Laenne Barbara Silva de; http://lattes.cnpq.br/1483699193923171; http://lattes.cnpq.br/7002327312102794; http://lattes.cnpq.br/7680483824638632
Astaxanthin is a carotenoid with applications in human and animal health and nutrition, biosynthesized by many microorganisms, including the microalga Haematococcus pluvialis. The astaxanthin biosynthesis process in this microalga is carried out in the cytoplasm, starting in the vegetative phase of the life cycle and ending in the cystic phase, when secondary carotenoids are induced through physical-chemical changes in cultivation. The production of H. pluvialis occurs in open or closed cultivation structures, in semi-continuous, continuous or discontinuous modes, presenting different growth variables, productivity and characteristics related to the purity of the culture. The processes resulting from the cultivation of microalga to obtain astaxanthin consists of biomass harvest, cell disruption, drying of biomass and astaxanthin extraction. Due to the processes necessary to produce biomass and astaxanthin, the production costs are high, depending on the methods of cultivation and processing, however it has a higher market value compared to other astaxanthin sources. The astaxanthin production from H. pluvialis becomes more viable and sustainable when the biorefinery model is applied, with the integration of bioprocessing to obtain products and co-products of high value, such as proteins, lipids, carbohydrates and pigments, as well as energy generation, in order to maximize benefits and limit costs.
Triploidia em organismos marinhos: uma análise bibliométrica
(2022-06-02) Costa, Bruno Borba Santos Ferreira; Olivera Gálvez, Alfredo; http://lattes.cnpq.br/7002327312102794; http://lattes.cnpq.br/0090047327576200
Triploidy can be defined as the presence of three complete sets of chromosomes in cells. The induction of this state can be performed in some animals as a method to obtain advantageous characteristics for aquaculture. The present study aims to provide a bibliometric analysis on research trends related to the use of triploidy in marine organisms. The analysis included scientific productions indexed to the Scopus and Web of Science databases, from 1984 to 2021. The compiled data was converted to the R-data reading format with the RStudio software along with the use of the Bibliometrix package. The analyzes were performed using the Biblioshiny tool. A total of 190 articles published among 78 different journals were obtained, with the participation of 619 authors and collaboration between different countries. For the period analyzed, there was an annual growth rate of publications of 7.36%. Canada, the United States and Norway were the countries with the highest number of publications. The most frequent topics were represented on a thematic map according to a ranking of centrality and density. Topics such as "growth", "survival", "sterility", "Atlantic salmon", and "Crassostrea gigas" were classified as basic themes, with great relevance for the structuring of the research field, but still in development. These data provide important information on trends in triploidy studies with marine organisms, contributing to future studies in this field of research.