afonso-physiologicalstressresponses-2008.pdf (531.24 kB)
Physiological stress responses in the warm-water fish matrinxã (Brycon amazonicus) subjected to a sudden cold shock
journal contribution
posted on 2008-12-01, 00:00 authored by L Inoue, G Moraes, G Iwama, Luis AfonsoLuis AfonsoThe present work evaluated several aspects of the generalized stress response [endocrine (cortisol), metabolic (glucose), hematologic (hematocrit and hemoglobin) and cellular (HSP70)] in the Amazonian warm-water fish matrinxã (Brycon amazonicus ) subjected to an acute cold shock. This species farming has been done in South America, and growth and feed conversion rates have been interesting. However, in subtropical areas of Brazil, where the water temperature can rapidly change, high rates of matrinxã mortality have been associated with abrupt decrease in the water temperature. Thus, we subjected matrinxã to a sudden cold shock by transferring the fish directly to tanks in which the water temperature was 10oC below the initial conditions (cold shock from 28ºC to 18oC). After 1h the fish were returned to the original tanks (28ºC). The handling associated with tank transfer was also imposed on control groups (not exposed to cold shock). While exposure to cold shock did not alter the measured physiological conditions within 1h, fish returned to the ambient condition (water at 28º C) significantly increased plasma cortisol and glucose levels. Exposure to cold shock and return to the warm water did not affect HSP70 levels. The increased plasma cortisol and glucose levels after returning the fish to warm water suggest that matrinxã requires cortisol and glucose for adaptation to increased temperature.
History
Journal
Acta amazonicaVolume
38Issue
4Pagination
603 - 609Publisher
Instituto Nacional de Pesquisas da AmazonicaLocation
Manaus, BrasilPublisher DOI
Link to full text
ISSN
0044-5967Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2008, Instituto Nacional de Pesquisas da AmazonicaUsage metrics
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