The reaction of young coho Oncorhynchus kisutch to declining oxygen levels during long-term exposure.

Waller, Uwe, Black, E., Burt, D., Groot, C. and Rosenthal, Harald (2000) The reaction of young coho Oncorhynchus kisutch to declining oxygen levels during long-term exposure. Journal of Applied Ichthyology, 16 . pp. 14-19. DOI 10.1046/j.1439-0426.2000.00168.x.

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The respiration of coho salmon, Oncorhynchus kisutch, weighing between 20 and 45 g was measured at gradually declining oxygen levels and at temperatures ranging between 14 and 17 °C. The maximum and minimum oxygen concentrations tested were 235 and 41 μmol/L, respectively. Respiration rates were measured for 24 h at 235 μmol/L before the oxygen concentration was lowered stepwise to 157 and 81 μmol/L. In one single trial, the oxygen level was lowered to 66, 53, and 41 μmol/L. Respiration was highly variable in time. Peak activities always occurred during the night. The standard metabolic rate at normoxic conditions was estimated to be around 4 μmol oxygen/g/h. The highest rates reached values close to 15 μmol oxygen/g/h. At reduced oxygen levels the standard oxygen demand slightly increased to 4.5 μmol oxygen/g/h, indicating a higher demand for vital metabolic functions. Due to the decrease of swimming activity, the maximum oxygen uptake rates dropped to < 8 μmol oxygen/g/h below 81 μmol/L oxygen concentration. Under long-term conditions, physiological and behavioural adaptations play an important role for survival and need to be considered for the design and operation of fish farm facilities.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Marine Evolutionary Ecology
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1046/j.1439-0426.2000.00168.x
ISSN: 0175-8659
Date Deposited: 18 Feb 2008 17:24
Last Modified: 23 Jun 2017 12:10

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