Parasitism by Nematopsis sp. (Apicomplexa: Eugregarinida) in Mytella guyanensis at the Marine Extractive Reserve Baía do Iguape, Bahia, Brazil

  • Valéria Macedo Almeida Camilo Universidade Federal do Recôncavo da Bahia, Centro de Ciências da Saúde; Universidade Estadual de Santa Cruz, Programa de Pós-Graduação em Desenvolvimento e Meio Ambiente
  • Jamille da Conceição Souza Universidade Federal do Recôncavo da Bahia, Centro de Ciências da Saúde
  • Fernanda de Freitas Universidade Federal do Recôncavo da Bahia, Centro de Ciências da Saúd,
  • Felipe Silva de Miranda Universidade Estadual de Santa Cruz, Departamento de Ciências Biológicas, Programa de Pós-Graduação em Biologia e Biotecnologia de Microrganismos
  • Sofia Campiolo Universidade Estadual de Santa Cruz, Programa de Pós-Graduação em Desenvolvimento e Meio Ambiente
  • Guisla Boehs Universidade Estadual de Santa Cruz, Programa de Pós-Graduação em Desenvolvimento e Meio Ambiente
Keywords: Bivalves, Parasitism, Environmental protection area, Protozoan, Environmental sustainability

Abstract

Several studies show the presence of protozoa of the genus Nematopsis Schneider, 1892, in many species of bivalves. The pathogenicity of this Apicomplexa is still much debated, which is possibly related to the parasitism degree and host habitat. In this context, this study investigated parasitism by Nematopsis sp. in Mytella guyanensis (Bivalvia: Mytilidae) in a mangrove of the Marine Extractive Reserve Baía do Iguape, Bahia, Brazil. The collections were made monthly, from March 2014 to March 2015, consisting of 30 adults with shell height above 40 mm per month, totaling 360 specimens. The specimens were measured, weighed, opened, and macroscopically examined for identifying parasites and/or signs of morphological changes. After that, they were fixed in Davidson’s solution and processed according to classical histological techniques, with inclusion in paraffin, obtaining 5 μm-thick sections by microtomy, and stained by Harris’ Hematoxylin and Eosin (HE). The water temperature ranged from 25.5 to 33.6 ºC and the salinity from 21.1 to 34.3 Practical Salinity Units (PSU). The specimens measured between 41.1 and 68.6 mm and had an average weight of 7.24 g. Macroscopically, there was no presence of the parasite or any morphological changes related its presence. The frequency percentage of Nematopsis sp. was 99.45%. The mantle was the organ with the highest frequency of infection (46.26%), followed by the gonads (18.36%). Among the analyzed organs, all presented the parasite and, in a few severely infected cases, microscopical changes were observed in the mantle conformation. The infection intensity for most of the sessions analyzed was 1 to 3 oocysts/phagocyte; however, in one of the sessions, 9 oocysts/phagocytes were recorded. The parasite had a negative correlation with salinity. The high frequency of Nematopsis sp. should be considered for the sustainability of natural stocks, especially if such parasitism occurs simultaneously with other pathogens and stressful environmental conditions.

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Author Biographies

Jamille da Conceição Souza, Universidade Federal do Recôncavo da Bahia, Centro de Ciências da Saúde

Discente do Centro de Ciências da Saúde, Universidade Federal do Recôncavo da Bahia – Avenida Carlos Amaral, nº 1015, CEP: 44574-520, Santo Antônio de Jesus, Bahia, Brasil.

Fernanda de Freitas, Universidade Federal do Recôncavo da Bahia, Centro de Ciências da Saúd,

Profesora Ajunta  da Universidade Federal do Recôncavo da Bahia, Área Ciências dos Alimentos. Doutora em Ciência Animal Tropical.

Published
2019-03-12
How to Cite
Camilo, V., Souza, J., Freitas, F., Miranda, F., Campiolo, S., & Boehs, G. (2019). Parasitism by Nematopsis sp. (Apicomplexa: Eugregarinida) in Mytella guyanensis at the Marine Extractive Reserve Baía do Iguape, Bahia, Brazil. Brazilian Journal of Veterinary Research and Animal Science, 55(4), e145204. https://doi.org/10.11606/issn.1678-4456.bjvras.2018.145204
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