title: Parasitism by Sphincterodiplostomum musculosum (Digenea, Diplostomidae) metacercariae in the eyes of Steindachnerina insculpta (Characiformes, Curimatidae).
abstract: New occurrences and effects of parasitism by metacercariae in fish eyes have recently been discussed in many studies. The aim of the present study was to evaluate the infection levels of the eye flukes Sphincterodiplostomum musculosum Dubois, 1936 (metacercariae) in Steindachnerina insculpta (Fernádez-Yépez, 1948) from three ecosystems under the influence of the Jurumirim reservoir (Paranapanema, Taquari and Veados Rivers). A total of 174 fish specimens were sampled between April 2011 and April 2012. There were high levels of infection by S. musculosum metacercariae in the eyes of S. insculpta from all the sampled ecosystems, thus presenting broad geographical distribution. The histological analyses revealed that the metacercariae were apparently lodged behind the retina. The smaller fish from the Taquari River were less parasitized by metacercariae than the adults. This pattern can be explained by the cumulative effect of parasitism, as demonstrated by the positive correlation between the abundance of metacercariae and fish body size.
authors: Universidade Estadual Paulista ?Júlio de Mesquita Filho? ? UNESP, Botucatu, SP, Brasil.
authors: Heleno
authors: H
authors: Brandão
authors: Universidade Estadual Paulista ?Júlio de Mesquita Filho? ? UNESP, Botucatu, SP, Brasil.
authors: Fábio Hideki
authors: FH
authors: Yamada
authors: Universidade Estadual Paulista ?Júlio de Mesquita Filho? ? UNESP, Botucatu, SP, Brasil.
authors: Gislayne de Melo
authors: Gde M
authors: Toledo
authors: Universidade Estadual Paulista ?Júlio de Mesquita Filho? ? UNESP, Botucatu, SP, Brasil.
authors: Aline Angelina
authors: AA
authors: Acosta
authors: Universidade Estadual Paulista ?Júlio de Mesquita Filho? ? UNESP, Botucatu, SP, Brasil.
authors: Edmir Daniel
authors: ED
authors: Carvalho
authors: Universidade Estadual Paulista ?Júlio de Mesquita Filho? ? UNESP, Botucatu, SP, Brasil.
authors: Reinaldo José da
authors: RJ
authors: Silva
mesh_terms: D000818:Animals; D060125:Characiformes / Q000469:parasitology*; D005123:Eye / Q000469:parasitology*; D015822:Eye Infections, Parasitic / Q000469:parasitology / Q000662:veterinary*; D058488:Metacercariae / Q000502:physiology*; D014200:Trematoda / Q000502:physiology*