Navegando por Orientadores "PAIVA, Rosildo Santos"

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Acesso aberto (Open Access)
Avaliação sanitária de água de cultivo e de ostras da zona do salgado, nordeste do Estado do Pará - Brasil
(Universidade Federal do Pará, 2011-04-19) KIYATAKE, Daniela Mayumi; RIBEIRO, Karla Tereza Silva; http://lattes.cnpq.br/2654817572738748; PAIVA, Rosildo Santos; http://lattes.cnpq.br/0510818763187669
The cultivation of oyster species of the genus Crassostrea is expanding in the northeast of the Brazilian state of Pará. This study analyzes the sanitary quality of the oysters and the water in which they are cultivated in the local municipality of São Caetano de Odivelas and Curuçá. Samples were collected monthly between June, 2009, and May, 2010. Water samples were collected from the flood and the ebb tides, and approximately 15 oysters were obtained each month. Coliform concentrations were determined using the multiple-tube fermentation technique, followed by the biochemical identification of the bacteria and determination the susceptibility profile of Escherichia coli isolated from oysters and water samples. The geometric mean concentration of thermotolerant coliforms in the water was 119 MPN/100 mL in São Caetano de Odivelas and 163,21 MPN/100 mL in Curuçá, well above the limit of 43 MPN/100 mL established by the Brazilian National Environment Council (CONAMA). As Brazilian legislation on the sanitary quality of bivalve mollusks covers only the processed product, the European Union legislation, which assigns oysters for raw consumption to three sanitary classes, was adopted for the evaluation of the results of the present study. In São Caetano de Odivelas only two of the samples collected during this study were assigned to class A, seven samples to class B and three samples to class C. While in Curuçá three samples were assigned to class A, seven samples to class C and two samples to class C. The results suggest the need for mitigation measures to ensure the health quality of the oysters, such as the application of methods of depuration.
Acesso aberto (Open Access)
Cestóides da ordem Trypanorhyncha em peixes de importância comercial capturados no litoral amazônico
(Universidade Federal do Pará, 2008) DIAS, Lilian de Nazaré Santos; MATOS, Edilson Rodrigues; http://lattes.cnpq.br/7895814591867510; PAIVA, Rosildo Santos; http://lattes.cnpq.br/0510818763187669
The purpose of this study was to identify the parasite fauna, particularly the cestode Trypanorhyncha the order, which affects market value of fish caught in Amazon coastal and assess the possible impacts on fisheries production industry. We examined 328 samples of five species of fish: Cynoscion acoupa, Macrodon ancylodon, Plagioscion squanosissimus, Centropumus undecimalis, Arius Parkeri. It made the measurement of its total length and weighing fish, filleting in the regions examined body, muscles and serous. The blastocyst, Trypanorhyncha were removed and sent for laboratory Azevedo Carlos. All species surveyed were parasitized by Trypanorhyncha, totaling 283 (73.78%) parasitized copies. The species Callitetrarhynchus gracilis showed higher prevalence parasite. Poecilancistrium caryophyllum was the most infect the species of fish studied, followed by Pterobothrium crassicolle and Pterobothrium heteracanthum and Callitetrarhynchus speciosum, infected Cynoscion acoupa and Arius Parkeri respectively. The regions abdominal muscles and backside were the most affected.
Acesso aberto (Open Access)
Composição centesimal, colesterol e maturação ovariana do Acetes marinus Omori, 1975 coletado no Baixo Tocantins
(Universidade Federal do Pará, 2007-11-30) ASSUNÇÃO, Antônia do Socorro Américo de; LOURENÇO, Lúcia de Fátima Henriques; http://lattes.cnpq.br/7365554949786769; PAIVA, Rosildo Santos; http://lattes.cnpq.br/0510818763187669
The specie Acetes marinus Omori, 1975, have full use as food constituting themselves into a kind of nutritional importance to the regional population, however, it is few studied. To contribute to a better use of this resource were conducted monthly collections of A. marinus during the months of January 2006 to June 2007, in two beaches, near of the Cametá town in low Tocantins river. They were certain the composition centesimal (%) and the content of cholesterol (mg/100g) relating to environmental parameters: pH, temperature and material in suspension of the subsurface water. The characterization of ovarian development, were based on the macro-and microscopic changes. For these two beaches the annual average pH was 7.52 ± 0.71, the temperature was 26.57 ° C ± 1.26, and the material in suspension was 73mg / L ± 65.53. For the composition centesimal of A. marinus got itself: 87.1% ± 1.1- moisture; 9.8% ± 1.3-ash, 71% ± 1.8-protein, 5.4% ± 2.9-lipids; 13.7 % ± 2,6- carbohydrates; 387.6% ± 13.2 kcal - calorific value. The content of cholesterol was 374.87 mg/100g ± 207.08. Was revealed a large potential nutrition, especially protein, for this species, but it is rich in cholesterol. And for developing ovarian were described three stages of maturation, based on four different types of oocytes.
Acesso aberto (Open Access)
Composição e distribuição espaço temporal de ovos e larvas de peixes, nos estuários dos Rios Curuçá e Muriá (Curuçá-Pará)
(Universidade Federal do Pará, 2005-06-01) PALHETA, Glauber David Almeida; PAIVA, Rosildo Santos; http://lattes.cnpq.br/0510818763187669
Estuaries are surrounding of Transistion enter and the continent and the ocean, where rivers find the sea, resulting in the measurable dilution of the salty water. This study was carried through in order to determine the composition and distribution of eggs and larval periods of training of fish (ichthyoplankton) of the estuaries of the rivers Curuçá and Muriá, located in the northeast state of Pará (Br). For this semimonthly collections in receding tides diurne and of quadrature from September of 2003 until July of 2004 had been carried through. They had been daily pay established four stations to the long one of the estuary of the two rivers. They had been carried through measured of condutivity, pH, temperature and oxygen dissolved and carried through samples to a meter of depth that had been made with a net with mesh of 500μm and 50 cm of mouth opening, in which was connected a fluxgate Samples had been conserved with formol 4%. They had been registered 1,326 larvae, being that of these, 451 had been showed in the river Muriá and 875 larvae in the Curuçá river. The identified larvae of fish belong to the 11 families (Engraulidae, Clupeidae, Gobiidae, Scianidae, Carangidae, Pleuronectidae, Tetraodontidae, Beloniidae, Soleidae, Achiriidae and Scorpaenidae). The biggest densities had been registered in the months of July, January and March. It did not have a space standard of distribution of the larvae with the ambiental variables. The estuary of the city of Curuçá was represented mainly by clupeiformes (family Engraulidae and Clupeidae), that they play important role in the trophic net of this ecosystem as well as excellent paper in the local feeding.
Acesso aberto (Open Access)
Dinâmica da comunidade microfitoplanctônica relacionada com os parâmetros físico-químicos do estuário do rio Guajará-Mirim (Vigia - PA)
(Universidade Federal do Pará, 2009-03-31) CARDOSO, Fábio Ferreira; PAIVA, Rosildo Santos; http://lattes.cnpq.br/0510818763187669
Estuaries are rich nutrients environments, favoring reproduction and development of several species. Phytoplankton represents a considerable portion of primary production in these environments and, together with other factors, regulates the biological productivity levels. This study aimed to know the microphytoplankton dynamics and its correlation with environmental factors in the Guajará-mirim river’s estuary in the city of Vigia-PA, an important fishery center of the Pará state. Every two months were made collections of the phytoplankton and take measurements of physicochemical parameters in four collection stations along the estuary, in ebb and flood tide periods. Were determined the specific composition and density of microphytoplankton (org.L-1) and analysis of frequency of occurrence, diversity and evenness, clustering and principal components. Seasonally, was noted, mainly during the ebb tide, a considerable physicochemical variation, strongly related with hydrological cycle in the region. Seventy-eight taxa were recorded belonging to the Bacillariophyta (65), Chlorophyta (6), Cyanophyta (3), Dinophyta (3) and Ochrophyta (1) divisions. Bacillariophyta was dominant in species number, frequency of occurrence and density (99.89%). The monthly average densities of the microphytoplankton ranged from 9.999 (July) to 535.411 org L-1 (January). In January happened a bloom of Skeletonema costatum (max = 1.996.613 org.L-1). The microphytoplankton community was characterized as the median diversity (annual general mean = 2.40). The seasonal variation of physicochemical parameters and species density was the predominant factor to the grouping of samples, and it formed two major groups, the first composed by samples of the rainy season and the second by samples of the drought period. The principal components analysis showed that, despite the physicochemical parameters have low spatial and seasonal variability, the variation in rate of rainfall, total dissolved solids content and salinity was decisive in the variation of density of most species and also promoted a slight increase in diversity in the drought period.
Acesso aberto (Open Access)
Estrutura da comunidade microfitoplanctônica da área de influência da UHE de Tucuruí-Pará
(Universidade Federal do Pará, 2011-06-02) TAVARES, Milena Daisy Ribeiro Monteiro; PAIVA, Rosildo Santos; http://lattes.cnpq.br/0510818763187669
Acesso aberto (Open Access)
Qualidade ambiental, distribuição e densidade do mesozooplâncton do estuário de Guajará-Miri, Vigia de Nazaré, NE do Estado do Pará
(Universidade Federal do Pará, 2007-12-03) RAMOS, Caio Aguiar Rodrigues; MELO, Nuno Filipe Alves Correia de; http://lattes.cnpq.br/4989238044542736; PAIVA, Rosildo Santos; http://lattes.cnpq.br/0510818763187669
Acesso aberto (Open Access)
Variação espaço temporal da comunidade zooplanctônica em viveiros de cultivo de camarão branco, Litopenaeus vannamei (Boone, 1931), no município Curuçá, Pará-Brasil
(Universidade Federal do Pará, 2011-04-04) NASCIMENTO, Atilla Melo do; PAIVA, Rosildo Santos; http://lattes.cnpq.br/0510818763187669
Acesso aberto (Open Access)
Variação nictemeral do microfitoplâncton em um estuário do nordeste paraense, Brasil
(Universidade Federal do Pará, 2010-06-18) COSTA, Brenda Oliveira da; PAIVA, Rosildo Santos; http://lattes.cnpq.br/0510818763187669
This study’s object was to get to know micro phytoplankton’s diversity, as its nyctemeral variation related to environmental factors on Curuçá river (Curuçá, PA – Brazil). Twelve phytoplankton samples were collected in 3 collecting spots next to a Littopnaeus vannamei sea shrimp farm in a 24 hour time, during spring tides on the 14th and 15th of august 2004 and on the 24th and 25th of January 2005. It was determined its specific composition and phytoplankton density (org.L-1), analyzed its occurrence rate, diversity and evenness, grouping and main components. Physicochemical parameters did not show any significant variability between the collecting months, though it was observed an important rainfall influence on the salinity, filing the bottom values in jan/05 and the top ones in aug/04. There were 170 registered taxa that belong to the Baccilariophyta (149), Dinophyta (16), Chlorophyta (3) and Cyanobacteria (2) divisions. Bacillariophyta had the higher number of species shown, higher occurrence and density (97.59%). A few showed high abundance rates. During August the phytoplankton community is dominated by Bacteriastrum hyalinum, Bellerochea horologicalis, Chaetoceros curvisetus, Dimerograma dubium, Dytilium brigtwelli, Pseudo-nitzschia seriata and Skeletonema costatum. In January predominated Chaetoceros pseudocrinitus, Chaetoceros curvisetus and Skeletonema costatum. Neritic marine planktonic species, oceanic marine planktonic, neritic-oceanic marine planktonic predominated the samples. Specific diversity oscillated from 0.7591 bits.org-1 to 1.3314 bits. org-1 generally characterized by a low to very low diversity, showing a poorly diversified structure. Phisicochemical parameters and density among species was the main factor to determinate sample grouping in two big groups: the first one with august samples and the second one with January samples. Its component analysis showed that despite its low physicochemical variation amongst the collecting months, the rainfall and salinity variations were really important on the species density, causing an increase on phytoplankton density in January.