Urophyseal control of plasma ionic concentration in Oreochromis mossambicus (Pisces) exposed to osmotic stress

Autores

  • Bernardo Baldisserotto Departamento de Fisiologia, Centro de Ciências da Saúde - CCS, Universidade Federal de Santa Maria - UFSM, Santa Maria, RS.
  • Olga M. Mimura Departamento de Fisiologia, Instituto de Biociências, USP, São Paulo, SP.
  • Luiz C. Salomão Departamento de Fisiologia, Instituto de Biociências, USP, São Paulo, SP.

DOI:

https://doi.org/10.5902/2179460X26385

Resumo

Exemplares de Oreochromis mossambicus adaptados à água doce e à água salgada foram submetidos a 5 tratamentos diferentes (urofisectomia, operação testemunho, injeção de extrato urofisário, injeção de salina e controle) e transferidos para água salobra. os peixes adaptados à água doce transferidos para água salobra a urofisectomia aumenta as concentrações de Na+, K+,
Ca++ e osmótica do plasma. Em peixes adaptados à água salgada transferidos para água salobra as concentrações plasmáticas de Na+ e K+ são mais baixas no grupo controle do que nos outros grupos experimentais. A urófise parece atuar apenas no "ajuste fino" dos processos osmorregulatórios. A adaptação às mudanças de salinidade do meio provavelmente são reguladas principalmente pela prolactina e pelo cortisol.

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Publicado

1994-12-12

Como Citar

Baldisserotto, B., Mimura, O. M., & Salomão, L. C. (1994). Urophyseal control of plasma ionic concentration in Oreochromis mossambicus (Pisces) exposed to osmotic stress. Ciência E Natura, 16(16), 39–50. https://doi.org/10.5902/2179460X26385