Navegando por Assunto "Pargo (Peixe)"

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Acesso aberto (Open Access)
Análises populacionais em Lutjanus purpureus (Poey, 1866) da costa atlântica ocidental a partir de marcadores moleculares
(Universidade Federal do Pará, 2015-03-02) SILVA, Raimundo Darley Figueiredo da; GOMES, Grazielle Fernanda Evangelista; http://lattes.cnpq.br/5740656339448561; SCHNEIDER, Horacio; http://lattes.cnpq.br/3621033429800270
Marine organisms with wide distribution are excellent models for the understanding of historical genetic connectivity patterns. Lutjanus purpureus, or Caribbean snapper, as the species is popularly known, is a marine Teleost belonging to the Family Lutjanidae. The species distribution is from Cuba to the Northeast of Brazil, being often found on rocky and sandy bottoms. It has high economic importance, however there are few studies available on the genetic architecture of the species. Of major goals of this study, the first deals with the development and characterization of the EPIC primers, for population approaches in L. purpureus, and others marine teleosts. The characterization of genomic regions with sufficient polymorphism to population analysis is fundamental for genetic studies with multiple unlinked regions. Were obtained eight primers, and the majority has high levels of genetic variation. EPIC primers have the advantage of being applicable on a wide taxonomic level, thereby these primers were tested and amplified in other taxonomic groups of organisms, so that an indication can be useful in various approaches to intraspecific groups of marine fish. The second main objective was to evaluate issues of genetic diversity, demographics and historical genetic connectivity for L. purpureus using multiple loci (mitochondrial and nuclear DNA). It was found high levels of genetic diversity, probably related to a high effective size presented by species. The Caribbean snapper apparently shows high levels of genetic homogeneity along of the study area, which is consistent with biological traits of species such as spawning in offshore and larval pelagic development. In relation to aspects of historical demography, a population growth scenario is presented, whose beginning is dated about 170,000 years, this period being congruent with a period of glacial maximum to the region of the western Atlantic.
Acesso aberto (Open Access)
Autenticação molecular de filés de pargo e protocolo forense para Lutjanídeos (Lutjanidae – Perciformes)
(Universidade Federal do Pará, 2015-03-02) VENEZA, Ivana Barbosa; GOMES, Grazielle Fernanda Evangelista; http://lattes.cnpq.br/5740656339448561; SAMPAIO, Maria Iracilda da Cunha; http://lattes.cnpq.br/2482763145819602
The demand for seafood has increased remarkably, and because of this, industries have diversified the presentation of fish, offering products processed as fillets, for example. This tendency on the one hand stimulates consumption, but on the other reduces its reliability since processed fish have high replacement rates. The process removes parts of the body used to recognize the species, and then the identification is compromised, especially in a large group of fish with morphological similarities, as is the case of the red snappers of Lutjanidae family. These fish have large worldwide economic interest, and in Brazil the most popular species is the Pargo - Lutjanus purpureus. There are several other factors that favor the replacement of this species: Joint capture the other snappers, inaccurate statistical record, popular nomenclature standard out and mislabelling of product. Therefore, this study investigated whether the fillets sold in supermarkets in Bragança-PA, under the label of "Pargo", to belong to species L. purpureus. Through DNA barcode method was able to detect 22% of the sampled fillets corresponded to the species Rhomboplites aurorubens, low commercial value snapper in the region. The results point to the need to prevent such practices, and provide grant to help fight the replacements, with the competent bodies, industry and supermarkets. Despite the effectiveness of barcode DNA technique for identification, there are more practical and inexpensive methods that have been suggested for the development of authentication protocols fishery products, such as those based on multiplex PCR. In view of the numerous reports of fraud in derivative products snappers, we developed a protocol for forensic identification banding pattern, for three of the main species of red marketed in Brazil: L. purpureus, L. synagris and Ocyurus chrysurus. This protocol is an alternative to be applied both for the supervision, in the search for replacement and so on protection of consumer rights; as in routine commercial and industrial sectors, in order to control quality and ensure the authenticity of products.
Acesso aberto (Open Access)
Can Lutjanus purpureus (South red snapper) be "legally" considered a red snapper (Lutjanus campechanus)?
(2008) GOMES, Grazielle Fernanda Evangelista; SCHNEIDER, Horacio; SOUZA, Marcelo Nazareno Vallinoto de; SILVA, Simoni Santos da; ORTI, Guillermo; SAMPAIO, Maria Iracilda da Cunha
Red snappers (Lutjanus purpureus in Brazil and Lutjanus campechanus in USA and Gulf of Mexico) are both under clear effect of overfishing. Because of their high morphological similarity it has already been suggested that they could possibly be considered as a single species. To investigate the degree of similarity and the genetic structure of red snapper populations we constructed a common dataset of partial D-loop mtDNA sequences of L. purpureus from Brazil (Amapá, Pará and Maranhão) and L. campechanus from the Atlantic coast of the USA (Florida, Louisiana and Mississippi). Phylogenetic and population genetic analyses surprisingly depicted high similarity between L. campechanus and L. purpureus, compatible with the hypothesis of a single species of red snapper for the Western Atlantic Ocean. These preliminary but very curious findings open an important discussion regarding the legislation involved on the capture of this overexploited fish resources as well as regarding their taxonomy.
Acesso aberto (Open Access)
Dinâmica populacional do pargo, Lutjanus purpureus Poey, 1875 (Pisces: Lutjanidae) na plataforma norte do Brasil
(Universidade Federal do Pará, 2002-05-20) SOUZA, Rosália Furtado Cutrim; IVO, Carlos Tassito Correa; http://lattes.cnpq.br/0470299408088177; SOUZA, Raimundo Aderson Lobão de; http://lattes.cnpq.br/4922849102516924
Growth, mortality, biometry and reproduction of the red snapper, Lutjanus purpureus was researched from samples obtained from landings of commercial catches in the northern Brazilian coast with auspicious of REVIZEE program and Biology and Fishing of the red snapper in the northern Brazilian Project of the CEPNOR/IBAMA . Total and zoological length data obtained from approximately 500 individuals were collected monthly in the cities of Belém, Vigia and Bragança, from January 1999 to December 2000. Sub-samples of 150 fishes were obtained monthly from April 1998 to January 2000 to study reproduction and biometry. In the CEPNOR/IBAMA laboratory were carried out biometry, identification of sexy type and gonadal maturation stages. The total of 16. 733 specimens, presents percentile superiors at 50% of young individuals. The amplitude of total class varied from 13 to 112 cm of length and the length averages were 45,72 cm and 51,91 cm, respectively for the year of 1999 and 2000. The morphometric and weight/length relationships show positive allometry. The weight/length relation of male and female differ significantly from Student statistic method. The reproduction was researched determining the sexual proportion under chisquare statistics, the size of first maturation and spawning period, that was analyzed temporal variation of frequency of the gonadal stages and gonadal-somatic relation. The whole research period was observed a female predominance in the month analysis only in April 1998, May and June 1999 do not present significant differences between male and female. In sexual proportion, by class length the predominance of female was highly significant from 28 to 45 cm. The total length class of first maturation was estimated between 43 a 46 cm from females by graphic extrapolation method and the 43,67 cm by adjust of Galton ogive. The reproductive period was defined in two points, one more intense in the second quarter of the year, with a larger amplitude in may/1998 and another one reduced in the fourth quarter same year. Growth parameters were estimated by ELEFAN I system, Bhattacharya, Gulland & Holt and Appeldoorn methods in FiSAT program. The Appeldoorn method presents the better adjust to red snapper with value of L= 115 cm, K= 0,091 year-1, and determine von Bertalanffy equation Lt = 115 (1-e 0,091t-to). The natural mortality was estimated in 0,25 year-1 e 0,31 year-1 by Pauly and Rikhter & Efanov equations, respectively. The total mortality estimated by converted length in curve of linearized catch and Beverton & Holt method reached values of 0,59; 0,664 respectively. Mortality by fishing and exploitation rate were also calculated and obtained values F = 0,34 year1 e E = 0,57. The longevity estimated by Taylor equation was 33 years. The red snapper presents slow growth and longevity life with periodic spawn. The fishing in the northern Brazilian coast happen high percentile of young fishes. That can contribute to overfishing growth , compromising the sustentability of the species and the fishing activity in the northern Brazilian coast. It is indispensable to adopt regulation measures to red snapper fishing, at least about minimum size capture.