Physiological stress responses in the warm-water fish matrinxã (Brycon amazonicus) subjected to a sudden cold shock

Inoue, Luis Antonio Kioshi Aoki, Moraes, Gilberto, Iwama, George K. and Afonso, Luis Orlando Bertola 2008, Physiological stress responses in the warm-water fish matrinxã (Brycon amazonicus) subjected to a sudden cold shock, Acta amazonica, vol. 38, no. 4, pp. 603-609, doi: 10.1590/S0044-59672008000400002.

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Title Physiological stress responses in the warm-water fish matrinxã (Brycon amazonicus) subjected to a sudden cold shock
Formatted title Physiological stress responses in the warm-water fish matrinxã (Brycon amazonicus) subjected to a sudden cold shock
Author(s) Inoue, Luis Antonio Kioshi Aoki
Moraes, Gilberto
Iwama, George K.
Afonso, Luis Orlando Bertola
Journal name Acta amazonica
Volume number 38
Issue number 4
Start page 603
End page 609
Total pages 7
Publisher Instituto Nacional de Pesquisas da Amazonica
Place of publication Manaus, Brasil
Publication date 2008-12
ISSN 0044-5967
Keyword(s) cold shock
HSP70
Matrinxa
stress
Summary The 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.
Language eng
DOI 10.1590/S0044-59672008000400002
Field of Research 070401 Aquaculture
070405 Fish Physiology and Genetics
Socio Economic Objective 830102 Aquaculture Fin Fish (excl. Tuna)
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2008, Instituto Nacional de Pesquisas da Amazonica
Persistent URL http://hdl.handle.net/10536/DRO/DU:30047715

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