Journal
NEOTROPICAL ICHTHYOLOGY
Volume 9, Issue 4, Pages 895-900Publisher
SOC BRASILEIRA ICTIOLOGIA
DOI: 10.1590/S1679-62252011005000039
Keywords
Ariidae; Estuaries; Ionoregulation; Osmoregulation; Salinity; Sciaenidae
Categories
Funding
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
- CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior, Brazil)
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The purpose of this study was to investigate Na+, Cl-, K+, Ca2+, and Mg2+ levels in the plasma of freshwater and marine/estuarine teleosts collected at different salinities (0 to 34) from the estuarine and freshwater portions of the Sao Goncalo channel in Southern Brazil. Any relationship between plasma ion levels and salinity and the capacity of ionic regulation of teleosts found at three or more different salinities (Genidens barbus and Micropogonias furnieri) was also investigated. Results showed no relationship between plasma ion levels and salinity when considering all species together, but the two species collected from three or more different salinities showed a significant positive relationship between plasma ion levels and salinity, indicating that G. barbus and M. furnieri have a high capacity to regulate plasma ion levels at both low and high salinities.
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