Navegando por Autor "SAMPAIO, Dioniso de Souza"

Agora exibindo 1 - 3 de 3

Acesso aberto (Open Access)
Coordenação do comércio atacadista de pescado no mercado do ver-o-peso, em Belém-Pará
(Universidade Federal do Pará, 2016-09) OLIVEIRA NETO, Francisco Abraão Gomes de; DINIZ, Janaina Deane de Abreu Sa; LEITÃO, Wilma Marques; SAMPAIO, Dioniso de Souza
The Ver-o-Peso Market, freely translated as “check-the-weight” market, is one of the main fish unloading and marketing sites in Brazil. Thirty five thousand tons of fish are unloaded yearly at the market, involving several groups of individuals, such as balanceiros, local conditioned agents who trade the local production. The present research intends to demonstrate, through Economical Sociology assumptions, the importance of balanceiros in the fish commercialization model installed at Ver-o-Peso Market. The adopted methodology included bibliographic and documental research, semi-structured interviews, direct observation, audio and video registration. The analysis of the collected information was carried out through tabulation and ranking according to the assumptions of the Economical Sociology. The results demonstrate the importance of balanceiro as the logistical commerce coordinator of the transactions that are performed in the wholesale market of fresh fish on Pedra, the commercialization at the Ver-o-Peso Market. This study offers to the sector researchers and managers a perspective based on individual and collective motivations of the individuals involved in the establishment and development of local markets, in a context that goes beyond the economical assumptions of supply and demand, in a perspective that the keyword is social embeddedness.
Acesso aberto (Open Access)
Innovative molecular approach to the identification of Colossoma macropomum and its hybrids
(2012-06) CUNHA, Maria de Fátima Gomes; SCHNEIDER, Horacio; BARROS, Maria Claudene; SAMPAIO, Dioniso de Souza; HASHIMOTO, Diogo Teruo; PORTO-FORESTI, Fábio; SAMPAIO, Maria Iracilda da Cunha
Tambaqui (Colossoma macropomum) is the fish species most commonly raised in the Brazilian fish farms. The species is highly adaptable to captive conditions, and is both fast-growing and relatively fecund. In recent years, artificial breeding has produced hybrids with Characiform species, known as "Tambacu" and "Tambatinga". Identifying hybrids is a difficult process, given their morphological similarities with the parent species. This study presents an innovative molecular approach to the identification of hybrids based primarily on Multiplex PCR of a nuclear gene (α-Tropomyosin), which was tested on 93 specimens obtained from fish farms in northern Brazil. The sequencing of a 505-bp fragment of the Control Region (CR) permitted the identification of the maternal lineage of the specimen, all of which corresponded to C. macropomum. Unexpectedly, only two CR haplotype were found in 93 samples, a very low genetic diversity for the pisciculture of Tambaqui. Multiplex PCR identified 42 hybrids, in contrast with 23 identified by the supplier on the basis of external morphology. This innovative tool has considerable potential for the development of the Brazilian aquaculture, given the possibility of the systematic identification of the genetic traits of both fry-producing stocks, and the fry and juveniles raised in farms.
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.