Navegando por CNPq "CNPQ::CIENCIAS AGRARIAS::RECURSOS PESQUEIROS E ENGENHARIA DE PESCA::AQUICULTURA::OSTREICULTURA"

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Acesso aberto (Open Access)
Avaliação e comparação de projetos comunitários de ostreicultura localizados no nordeste paraense
(Universidade Federal do Pará, 2009) HOSHINO, Priscila; MCGRATH, David Gibbs; http://lattes.cnpq.br/4373475491613670
The aquaculture is being characterized as strategy to minimize the reduction of the fish. At Pará, the oyster farming was implanted in 2003 as an opportunity regarding to occupation and profits generation at Northeastern of this state. In 2005 this initiative was expanded to other communities with different levels of familiarity with the mollusk, regarding to the support either on the researches in this sector or on the extractive activity. This research evaluated the communitarian oyster farming performance in the state of Pará. It was studied three projects with at least two years of implementation and with either different levels of preservation and oyster harvest activity. The implementation of the firsts cultivations occurred simultaneously and in a similar way regarding to institutional support, however with different performances. The main producer issues are to obtain the license to develop this activity and also the necessity to take care about the tide. It is necessary to provide more detailed feasibility studies, with more commitment from the side of the interested institutions in order to perform the actions they are supposed to work out, providing events where it will be possible to spread the information and discuss the aquaculture bottlenecks at the state of Pará, as well to provide a consolidated partners network to prepare the groups regarding to organization, activity management and helping in the market access. The most part of the oyster famers are small producers, artisanal fishermen that found a way to manage their families via oyster farming. However, the oyster farming is a secondary activity to them, once it is still not enough to support their necessities. Nevertheless, several farmers already declared once they manage how to increase the oyster production they will be exclusively dedicated to this activity.
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)
Ostreicultura no nordeste paraense: estado atual e perspectivas futuras
(Universidade Federal do Pará, 2017-07-14) SAMPAIO, Dioniso de Souza; BEASLEY, Colin Robert; http://lattes.cnpq.br/6310836748316181
In the first article (Chapter 1), aspects related to the oyster culture supply chain in the state of Pará were evaluated. Between 2013 and 2014, research was carried out in seven associations involved in oyster culture through interviews with the president of each association, as well as with 56 members (72% of the total). Secondary data were obtained with the permission of management reports from the Brazilian Micro and Small Business Support Service of the State of Pará. The associations Agromar, Nova Olinda and Aquavila, Lauro Sodré stand out from the rest due to their larger on-growing areas and total production in 2013. However, smaller associations are more efficient with higher production per unit area. Although associations have grown in numbers since 2006, along with increased capacity and output due to government assistance, compared to other regions of Brazil, they need to be better organized internally. Associations should be less reliant on public funding and develop more partnerships with private enterprise. In addition, there must be active co-participation in the development of legislation and public policies that regulate oyster culture and the protection of natural oyster beds. In the second article (Chapter 2), the present study investigated the physico-chemical characteristics of water at all oyster farming units in Pará. Salinity, temperature (oC), oxidation-reduction potential (mV), pH, dissolved oxygen (mg.l-1), depth (m) and the concentration of chlorophyll-a (mg.m3) were measured in situ in both the dry season of 2013 and the rainy season of 2014. All variables, except depth, were significantly higher in the dry season. Mean salinity, which ranged from 2.4 to 46, is the most important variable that explains the variation between associations in relation to the season, date of sampling in each season and state of the tide. However, dissolved oxygen, pH and depth were also important.Oyster culture units in Pará can be defined in terms of water quality as suitable for harvesting xxii seed from the wild (lower salinity and pH), or for on-growing of adults (higher values of salinity, pH and depth). In the third article (Chapter 3), settlement, seed size, larval development in the laboratory, growth and aspects of the commercialization of cultivated oysters were investigated from 2012 to 2016 in five culture units in pará, during periods varying from 6 to 12 months. Seed length differed between December 2014 (21 mm) and April 2015 (12 mm) and smaller size appears associated with higher precipitation. Native seed numbers were higher in the on-growing area whereas abundance of exotic seed was low. Larval development is best at salinities of 16 and 21, in which the pediveliger stage appeared after 53 days. Oyster growth in culture was variable, but market size was reached in at least 4 months at Agromar, Aappns and Asapaq. Mortality ranged from 19% to 46%, comparable to other C. gasar cultures. Oyster mass varies monthly and between crops, and is related to pre-sale size selection. On average, oysters in the Baby and Médio classes are 77% and 80% shell. Aquavila is suitable for harvesting seed, whereas Agromar has the lowest mortality and is suitable for on-growing. Most of the oysters sold at Agromar are within the class limits, whereas those sold at Aquavila are larger.