title: Effects of aluminum on the energetic substrates in neotropical freshwater Astyanax bimaculatus (Teleostei: Characidae) females.
abstract: We investigated the effects of acidic pH and acute aluminum (Al) exposure on the metabolic substrates of Astyanax bimaculatus, and on the ability of these animals to recover in clean water. After an acclimation period, sexually mature A. bimaculatus females were sorted into six glass aquaria with three experimental groups: control in neutral pH (7.0), acidic pH (5.5), and Al (0.5 mg·L(-1)) in acidic pH (5.5). After a 96 h treatment, 10 animals from each experimental group were sampled and the rest were returned to clean water in neutral pH without Al for a recovery period of 96 h. The acidic pH, either alone or combined with Al, decreased T4 levels, whereas Al exposure increased T3 levels. Recovery of T3 levels occurred after 96 h. Al exposure decreased ovary and plasma proteins, muscle glycogen contents, and hepatic lipids due to lipoperoxidation. In the recovery phase, lipids decreased in most tissues, probably to re-establish ovary protein and hepatic glycogen. A. bimaculatus prioritized the use of energetic resources during acclimatization to Al instead of prioritizing reproduction, thereby avoiding the ovulation of impaired eggs.
authors.affiliation: Departamento de Fisiologia, Instituto de Biociências, Universidade de São Paulo, Brazil.
authors.forename: Vanessa A R O
authors.initials: VA
authors.lastname: Vieira
authors.forename: Tiago G
authors.initials: TG
authors.lastname: Correia
authors.forename: Renata G
authors.initials: RG
authors.lastname: Moreira
mesh_terms: D000143:Acids / Q000737:chemistry*; D000222:Adaptation, Physiological / Q000187:drug effects; D000535:Aluminum / Q000633:toxicity*; D000818:Animals; D001798:Blood Proteins / Q000378:metabolism; D060125:Characiformes / Q000378:metabolism*; D004734:Energy Metabolism / Q000187:drug effects*; D005260:Female; D029941:Fish Proteins / Q000378:metabolism; D005618:Fresh Water / Q000737:chemistry; D006003:Glycogen / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D050356:Lipid Metabolism / Q000187:drug effects; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D009132:Muscles / Q000187:drug effects / Q000378:metabolism; D010053:Ovary / Q000187:drug effects / Q000378:metabolism; D013974:Thyroxine / Q000097:blood; D013997:Time Factors; D023382:Toxicity Tests, Acute; D014284:Triiodothyronine / Q000097:blood; D014329:Tropical Climate; D014874:Water Pollutants, Chemical / Q000633:toxicity
chemical_list: D000143:Acids; D001798:Blood Proteins; D029941:Fish Proteins; D014874:Water Pollutants, Chemical; D014284:Triiodothyronine; D006003:Glycogen; D000535:Aluminum; D013974:Thyroxine