Swimming alters responses to hypoxia in the Adriatic sturgeon <i>Acipenser naccarii</i>

McKenzie, David J.; Steffensen, John F.; Korsmeyer, Keith E.; Whiteley, N.M.; Bronzi, P.; Taylor, E. W.

doi:10.1111/j.1095-8649.2007.01337.x

Cited by 37 publications

(22 citation statements)

References 23 publications

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“…4). This observation would support the findings of Crocker and Cech (1997), who concluded that white sturgeon exposed to even moderate hypoxia became hypometabolic (i.e., reduce their metabolic rate), a hypothesis supported by other studies (Burggren and Randall 1978;McKenzie et al 2007). Thus, an increased OBF may provide a mechanism to increase oxygen uptake and maintain tissue oxygen perfusion under moderate hypoxia, but cannot support aerobic metabolism when oxygen content in the water and diffusion gradients driving O 2 movement are very low (i.e., in this case, when water PO 2 is B10 mm Hg).…”

Section: Strategies Of Hypoxia Tolerance In Sturgeonsupporting

confidence: 86%

“…This lack of clear patterns in the response to hypoxia in sturgeon may also reflect a lack of a consistent methodology to produce hypoxia (e.g., rapid versus graded hypoxia, water temperature, fish size or level of hypoxia; see Table 2 and Perry et al 2009). Complicating things further is the recent discovery that swimming (McKenzie et al 2007) and diet (McKenzie et al 1997) can alter the hypoxia response in sturgeon.…”

Section: Discussionmentioning

confidence: 94%

“…The physiological response to hypoxia is varied across sturgeon species; thus, generalizations may be difficult to ascertain. For example, Burggren and Randall (1978) suggested that the white sturgeon, Acipenser transmontanus, is an oxy-conformer, while other species of sturgeon (e.g., A. baeri, A. naccarii) appear to be oxy-regulators over a broad range of oxygen levels (Nonnotte et al 1993; also see McKenzie et al 2007). In addition, hematological parameters, such as blood lactate and glucose, significantly change with hypoxia for some species of sturgeon, but this finding is reduced or absent for other sturgeon species.…”

Section: Discussionmentioning

confidence: 96%

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The effects of temperature on the physiological response to low oxygen in Atlantic sturgeon

Kieffer

Baker

Wood

et al. 2011

Fish Physiol Biochem

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Atlantic sturgeon (Acipenser oxyrhynchus), which are bottom dwelling and migratory fish, experience environmental hypoxia in their natural environment. Atlantic sturgeon, acclimated to either 5 or 15°C, were subjected to a 1 h severe (<10 mm Hg) hypoxia challenge in order to document their physiological responses. We measured hematological parameters, including O(2) transport (hemoglobin, hematocrit), ionic (chloride, osmolality), and metabolic (glucose, lactate) variables under normoxic conditions (~160 mm Hg), immediately following a 1 h exposure to hypoxic water, and following a further 2 h of recovery from this challenge in normoxic water. In a second experiment, we assessed the opercular beat frequency before, during, and after hypoxic exposure. Hemoglobin concentrations and hematocrit were significantly different between fish held at 5°C vs. 15°C and also significantly different between normoxia prior to hypoxia and following recovery. Plasma lactate concentrations increased following hypoxia at both temperatures, indicative of an increase in anaerobic metabolism. In contrast, a significant increase in plasma glucose concentrations in response to hypoxia only occurred at 5°C, suggesting different fuel demands under different temperatures. Changes in opercular beat frequency (OBF) were dependent on temperature. At 5°C, OBF increased upon exposure to hypoxia, but returned to pre-exposure levels within 35 min for the remainder of the experiment. During hypoxia at 15°C, OBF increased very briefly, but then rapidly (within 20 min) decreased to levels below control values. Following a return to normoxia, OBF quickly increased to control levels. Overall, these findings suggest that Atlantic sturgeons are relatively tolerant to short-term and severe hypoxic stress, and the strategies for hypoxia tolerance may be temperature dependent.

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Section: Strategies Of Hypoxia Tolerance In Sturgeonsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 96%

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The effects of temperature on the physiological response to low oxygen in Atlantic sturgeon

Kieffer

Baker

Wood

et al. 2011

Fish Physiol Biochem

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“…If aquatic P O2 drops toward P crit , the resulting hypoxia-induced drop in AS may cause important eco-physiological functions such as growth, activity and reproduction to be compromised (Chabot and Claireaux, 2008a). Major life-threatening processes are challenged at P O2 <P crit as the fish is forced into an oxygen-conforming state (McKenzie et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Anaemia adjusts the aerobic physiology of snapper (Pagrus auratus) and modulates hypoxia avoidance behaviour during oxygen choice presentations

Cook

Wells

Herbert

2011

Journal of Experimental Biology

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SUMMARYThe effect of altered oxygen transport potential on behavioural responses to environmental hypoxia was tested experimentally in snapper, Pagrus auratus, treated with a haemolytic agent (phenylhydrazine) or a sham protocol. Standard metabolic rate was not different between anaemic and normocythaemic snapper (Hct6.7 and 25.7gdl -1 , respectively), whereas maximum metabolic rate, and hence aerobic scope (AS), was consistently reduced in anaemic groups at all levels of water P O2 investigated (P<0.01). This reduction of AS conferred a higher critical oxygen limit (P crit ) to anaemic fish (8.6±0.6kPa) compared with normocythaemic fish (5.3±0.4kPa), thus demonstrating reduced hypoxic tolerance in anaemic groups. In behavioural choice experiments, the critical avoidance P O2 in anaemic fish was 6.6±2.5kPa compared with 2.9±0.5kPa for controls (P<0.01). Behavioural avoidance was not associated with modulation of swimming speed. Despite differences in physiological and behavioural parameters, both groups avoided low P O2 just below their P crit , indicating that avoidance was triggered consistently when AS limits were reached and anaerobic metabolism was unavoidable. This was confirmed by high levels of plasma lactate in both treatments at the point of avoidance. This is the first experimental demonstration of avoidance behaviour being modulated by internal physiological state. From an ecological perspective, fish with disturbed oxygen delivery potential arising from anaemia, pollution or stress are likely to avoid environmental hypoxia at a higher P O2 than normal fish.

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“…Under sustained decreases of DO concentration, fish try to main-tain their standard metabolic rate until they reach the P crit (McKenzie et al 2007). Below the P crit , fish survival is usually limited to a few minutes or hours (Barrionuevo et al 2010).…”

Section: Resultsmentioning

confidence: 99%

Effects of Hypoxia on the Physiology of Zebrafish (Danio rerio): Initial Responses, Acclimation and Recovery

Feng

Guo

Gao

et al. 2015

Bull Environ Contam Toxicol

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Hypoxia often occurs in aquatic environments as dissolved oxygen (DO) concentration decrease to a level where it is detrimental to aquatic organisms. To investigate the effects of hypoxia on the physiology of zebrafishes (Danio rerio), the organisms were kept at normoxic conditions (DO: 8 ± 0.3 mg L(-1): control group) or were subjected to mild (DO: 3 ± 0.3 mg L(-1)) or severe hypoxia (DO: 1 ± 0.2 mg L(-1)) for 48 h and a subsequent restoration of oxygen concentrations (DO: 8 ± 0.3 mg L(-1)) for another 96 h at 25°C. We found that the enzyme activities show different initial responses, acclimation and recovery to severe hypoxia relative to normoxic conditions, but no significant difference was observed between normoxic conditions and mild hypoxia. The results suggest that zebrafishes can acclimate to the mild hypoxia (3 mg L(-1)) quickly but oxidative damage would occur when DO decreased below 1 mg L(-1). Our findings could be useful for water resource managers to set protection limits of DO for aquatic organisms.

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Swimming alters responses to hypoxia in the Adriatic sturgeon Acipenser naccarii

Cited by 37 publications

References 23 publications

The effects of temperature on the physiological response to low oxygen in Atlantic sturgeon

The effects of temperature on the physiological response to low oxygen in Atlantic sturgeon

Anaemia adjusts the aerobic physiology of snapper (Pagrus auratus) and modulates hypoxia avoidance behaviour during oxygen choice presentations

Effects of Hypoxia on the Physiology of Zebrafish (Danio rerio): Initial Responses, Acclimation and Recovery

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