Alterações histológicas em placas ósseas do peixe cascudo Rineloricaria strigilata (Hensel) (Teleostei, Loricariidae) e sua freqüência no lago Guaíba, Rio Grande do Sul, Brasil

Description of histological abnormalities in the bony plates of the loricariid catfish Rineloricaria strigilata (Hensel) (Teleostei, Loricariidae) and analysis of its frequency in the lake Guaíba, Rio Grande do Sul, Brazil

Rineloricaria strigilata; bioindicator; neoplasm

Alterações histológicas em placas ósseas do peixe cascudo Rineloricaria strigilata (Hensel) (Teleostei, Loricariidae) e sua freqüência no lago Guaíba, Rio Grande do Sul, Brasil

Description of histological abnormalities in the bony plates of the loricariid catfish Rineloricaria strigilata (Hensel) (Teleostei, Loricariidae) and analysis of its frequency in the lake Guaíba, Rio Grande do Sul, Brazil

Fábio Flores-Lopes^I; Luiz R. Malabarba^I,II; Edson H.L. Pereira^II; José F. Pezzi da Silva^II

^IPós-Graduação em Biologia Animal, Departamento de Zoologia, Instituto de Biociências, Universidade Federal do Rio Grande do Sul. Avenida Bento Gonçalves 9500, prédio 43435, bloco IV, 90540-000 Porto Alegre, Rio Grande do Sul, Brasil

^IIMuseu de Ciências e Tecnologia, Pontificia Universidade Católica do Rio Grande do Sul. Avenida Ipiranga 6681, Caixa Postal 1429, 90619-900 Porto Alegre, Rio Grande do Sul, Brasil

ABSTRACT

Little information is available about natural populations of fishes exposed to polluted waters in Brazil. Contaminants may be lethal or predispose fishes to sickness, being the analysis of aquatic organisms a good indicator of environmental quality. The violinha, Rineloricaria strigilata (Hensel, 1868), is a common loricariid catfish in the Guaíba lake basin, Rio Grande do Sul, Brazil, and has been selected as a bioindicator for being resident, occurring in more than 50% of the samples, and by showing externally detectable neoplasies. These are characterized by its dark pigmentation, bony plates hypertrophy, and hypertrophy and irregular arrangement of the odontodes. Histology showed hypertrophied epitelial tissues, with an increased number of secretory cells, blood cells, and melanina pigments, giving the dark appearance to the neoplasm. Observed frequencies of neoplasm were higher in lake Guaíba than in comparativo samples. Inside lake Guaíba, a pattern of distribution of neoplasm was observed, with the absence of neoplasm in fishes at the collected site that receives water from rio Jacuí, and frequencies of 3.04 to 16.81% in the collection localities in front of Porto Alegre and downstream localities, that receive water from rio Jacuí, rio dos Sinos and rio Gravataí, that drain urban and industrial area of Porto Alegre and neighborhood cities.

Key words:Rineloricaria strigilata, bioindicator, neoplasm

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AGRADECIMENTOS. Os autores são gratos ao Prof. Dr. João Carlos B. Cousin pela valiosa revisão crítica do artigo. As coletas foram realizadas com auxílio da RIOCELL.

Recebido em 11.V.2000; aceito em 16.VII.2001.

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Datas de Publicação

• Publicação nesta coleção
  08 Maio 2009
• Data do Fascículo
  Set 2001

Histórico

• Aceito
  16 Jul 2001
• Recebido
  11 Maio 2000