• Journals
  • Discipline
  • Indexed
  • Institutions
  • About
JavaScript is disabled for your browser. Some features of this site may not work without it.
View Item 
  •   Home
  • Pontificia Universidad Católica de Valparaíso
  • Latin American Journal of Aquatic Research
  • View Item
  •   Home
  • Pontificia Universidad Católica de Valparaíso
  • Latin American Journal of Aquatic Research
  • View Item

EFFECTS OF PARASITISM IN GILLS OF CENTROPOMUS UNDECIMALIS (PISCES, CENTROPOMIDAE) OF A PROTECTED AREA IN SÃO LUÍS (MARANHÃO, BRAZIL)

Parasitism in gills of Centropomus undecimalis (Pisces, Centropomidae) from a protected area in São Luís, Maranhão, Brazil

Author
Cantanhêde, Sildiane Martins

Sodré Campos, Vívian Cristina

Pestana Pereira, Dayane

Medeiros, Almerinda Macieira

Carvalho Neta, Raimunda Nonata Fortes

Tchaicka, Ligia

Santos, Débora Martins Silva

Full text
http://lajar.ucv.cl/index.php/rlajar/article/view/vol46-issue2-fulltext-13
10.3856/vol46-issue2-fulltext-13
Abstract
Effects of contaminants in fishes might be manifested in many levels of biological organization, including the cause of lesions in gills. This study aimed to identify damages caused by parasites to Centropomus undecimalis’ gills’ tissue structure (Bloch, 1972) and evaluates the quality of fishes’ community in the Ecological Park of Laguna da Jansen, São Luis, Maranhão, Brasil. A number of 33 exemplars of C. undecimalis were used, the first right gill arch was removed from each animal and fixed in 10% formaldehyde, fixed in 10% formalin for 24 hours, afterwards it was decalcified in 10% nitric acid, dehydrated in increasing concentrations of alcohols, diaphanized in in xylene, impregnated and included in paraffin. The 5μm thick cuts were stained with hematoxylin and eosin for histologic description. The parasitological search was performed by light microscopy and the lesions were evaluated through Histological Change Index. From the fishes collected, 48.4% presented parasitic changes associated to structural gills changes, such as epithelial hyperplasia and mucus. It was diagnosed presence of parasites in the gills of the sampled specimens, which belong to three families from the group Monogenea and myxosporean cysts. The Histological Change Index average was 53.3 demonstrating that individuals from species C. undecimalis’s gills collected presented severe tissue modifications. Therefore, the results show that the fishes sampled present a likely imbalanced host-parasite-environment
 
Parasitism in fish can occur due to an imbalance in the environment-host-parasite relationship, usually associated with poor environmental quality. The present study aimed to determine the frequency of parasitism and histological alterations in the gills of Centropomus undecimalis from the Jansen Lagoon Ecological Park in São Luís, Maranhão, Brazil. Thirty-three specimens of C. undecimalis were collected. The first right gill arch was removed from each animal and fixed in 10% formalin for 24 h. These were then decalcified in 10% nitric acid, dehydrated in increasing concentrations of alcohol, clarified in xylene and impregnated with and embedded in paraffin. Five-μm thick sections were stained with hematoxylin and eosin for histologic description and to determine parasite frequency. The gill lesions of each fish were semiquantitatively evaluated by calculating the histological alteration index (HAI). Structural alterations in the gills, such as epithelial hyperplasia and mucus, were associated with parasites in 48.4% of the fish. Three families of parasites from the Monogenean and Myxosporean groups were identified. The HAI average was 53.3, demonstrating that individuals collected from C. undecimalis had severe tissue modifications. Therefore, parasitism caused structural damages in the gill tissues of sampled fish, damages that can impair the organ’s physiology, and harm the fish health.
 
Metadata
Show full item record
Discipline
Artes, Arquitectura y UrbanismoCiencias Agrarias, Forestales y VeterinariasCiencias Exactas y NaturalesCiencias SocialesDerechoEconomía y AdministraciónFilosofía y HumanidadesIngenieríaMedicinaMultidisciplinarias
Institutions
Universidad de ChileUniversidad Católica de ChileUniversidad de Santiago de ChileUniversidad de ConcepciónUniversidad Austral de ChileUniversidad Católica de ValparaísoUniversidad del Bio BioUniversidad de ValparaísoUniversidad Católica del Nortemore

Browse

All of DSpaceCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

My Account

LoginRegister
Dirección de Servicios de Información y Bibliotecas (SISIB) - Universidad de Chile
© 2019 Dspace - Modificado por SISIB