Parasitic castration, growth, and sex steroids in the freshwater bonefish Cyphocharax gilbert (Curimatidae) infested by Riggia paranensis (Cymothoidea)

being unable to repro-duce. Fish were sampled in the middle rio Itabapoana, Brazil, to study the prevalence of parasitism, growth, and sex steroidconcentrations, considering the body size, sex, and reproductive condition of specimens. Most of the fish analyzed wereinfested (56.0%). The presence of two lines on the scales was more frequent among infested fish (22.0%) than among fishwithout parasites (12.0% for females and 10.0% for males). The occurrence of three lines on the scales was rare (3.5% amonginfested and 2.0% among females without parasites). These results suggest that growth of the host is faster than that of noninfested fish. The serum concentrations of sex steroids from fish without parasites varied at different gonadal developmentstages (17 beta-estradiol: 60.0 to 976.7 pg/ml; total testosterone: 220.0 to 3,887.7 pg/ml). All infested fish had lower levels of thetwo sex steroids and undeveloped gonads. Sex steroids levels in infested females were close to those in females at post-spawning stages. Total testosterone concentrations of infested males were below those of males at early gonadal maturationstage. These results suggest that

• Publication year

  2007

• Venue

  Neotropical Ichthyology

• Publication date

  2007-12-01

• Fields of study

  Biology, Environmental Science

• Identifiers
  DOI 10.1590/S1679-62252007000400006
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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