Compostos organoclorados em uma raia criticamente ameaçada, Gymnura altavela (LINNAEUS, 1758), no estuário da Baía de Guanabara, Rio de Janeiro, Brasil.

• Autor(a) principal: Paiva, Larissa Gouvêa
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/13899
• topic: Organochlorine compounds; Contamination; Guanabara Bay; Gymnuridae; Gymnura altavela; Elasmobranchs; Compostos organoclorados; Contaminação; Baía de Guanabara; Gymnuridae; Gymnura altavela; Elasmobrânquios; CNPQ::CIENCIAS BIOLOGICAS::FARMACOLOGIA::TOXICOLOGIA

In recent years, issues involving the storage of elasmobranchs have received increased attention in many countries. Mainly due to fishing pressure, many species now considered endangered by the IUCN, prompting the need for fisheries management and development of management plans. Persistent Organic Pollutants the match longer a threat to this group of fish, however, studies involving the contamination of these organisms are recent and have been increasing in recent years. This study aimed to quantify organochlorine compounds in liver from one species of critically endangered the ray, Gymnura altavela, resident in Guanabara Bay, one of estuarine environments more impacted than Brazil. In addition, we investigated the influence of biological factors, such as sexual maturation stage, sex, size and percentage lipid in the parsed matrix over contamination profiles for these xenobiotics. The concentrations of organochlorine compounds were determined using the gas chromatograph with electron capture detector (GC-ECD), the brand Agilent Technologies, model 7890. Our results have shown that polychlorinated bifelinas (PCB) represent the most important class contaminants with an average concentration of 6.772,8 (± 4.659,4) ng.g-1 lipid and the highest concentration was 18.513,1 ng.g-1 lipid in a male young person. Of this total, 66,5% were represented by congeners of PCBs 153> 138> 180> 101> 170. As the number of chlorine atoms, PCBs belong to the class of hexa-chlorinated were the most abundant. The average concentration was ΣDDT 646 (± 722,4) ng.g-1 lipid and the more representative isomer was p,p'- DDE 65,7% of the total. The ΣHCH, HCB and Mirex represented 0.13% of the total contamination in G. altavela and therefore, compounds with the smaller contributions. The reason represented by ΣDDT/ΣPCB formula was 0,09 characterizing a predominance of compounds of industrial origin. The Spearman correlations indicated a decrease in ΣPCB concentrations, ΣHCH and Mirex to grow as individuals. There were no differences in the concentrations for the different stages of sexual maturity and between males and females