Ecologia parasitária de isópodos e biologia reprodutiva em tibiro, Oligoplites spp (Osteichthyes: carangidae) das águas costeiras de Natal, Rio Grande do Norte

• Ano de defesa: 2008
• Autor(a) principal: Araújo, Gustavo Soares de
• Orientador(a): Chellappa, Sathyabama
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Rio Grande do Norte
• Programa de Pós-Graduação: Programa de Pós-Graduação em Ciências Biológicas
• Departamento: Biodiversidade; Biologia Estrutural e Funcional.
• País: BR
• Palavras-chave em Português: Ectoparasitos; Isópodos; Cymothoa spinipalpa; Peixe marinho; Oligoplites palometa; Oligoplites saurus
• Palavras-chave em Inglês: Ectoparasites; Isopods; Cymothoa spinipalpa; Marine fish; Oligoplites palometa; Oligoplites saurus
• Área do conhecimento CNPq: CNPQ::CIENCIAS BIOLOGICAS::ECOLOGIA
• Link de acesso: https://repositorio.ufrn.br/jspui/handle/123456789/13039

Oligoplites palometa (Cuvier) and Oligoplites saurus (Bloch & Schneider) (Osteichthyes: Carangidae) are coastal pelagic fish species. The objective of this study was to investigate the effect of parasitism by isopods and the reproductive biology of the leather jack, Oligoplites spp. A total of 113 individuals of Oligoplites spp (35 of O. saurus and 78 of O. palometa) were captured during the period between January, 2005 and July, 2007 from the coastal waters of Natal, RN. The morphometric and meristic characters were registered; macroscopic analyses were done to collect the isopod parasites and the gonads were observed to verify the reproductive aspects. The crustacean isopod parasite, Cymothoa spinipalpa (Isopoda: Cymothidae) was encountered on the tongue in the oral cavity in both fish hosts. The parasitic indices of C. spinipalpa showed high values of prevalance of 51,4% for O. saurus and 64,1% for O. palometa. The host presented significant correlations between body mass and body length of O. palometa and the number of parasites. Body lengths of female C. spinipalpa were small due to the limited space available in the oral cavity of the host. There was a significant difference in the sex ratio of O. palometa, males outnumbered the females. The isopod parasites showed specificity to the oral cavity of hosts. Macroscopic analyses of gonads showed four stages of gonadal development for both sex of O. palometa: immature, maturing, mature and spent