Respiratory adaptations of sacramento blackfish, Orthodon microlepidotus (ayres), for hypoxia

Cech, Joseph J.; Mitchell, Stephen J.; Massingill, Michael J.

doi:10.1016/0300-9629(79)90612-1

Cited by 16 publications

(8 citation statements)

References 16 publications

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“…In the first experiment, the test fish were all males of body weight = 0.180 f O.05Og (t f SD); in the second, all females (weight = 0.780 f 0.240 g) were used. A continuous flow (-150ml min-l) of hypoxic water from a gas stripping column (Cech et al 1979) gradually replaced the water in the tank, lowering the oxygen tension (P%). Gambusia surfacing behavior was observed and water samples were carefully taken (micro-bore tubing) from a distance of l m .…”

Section: Surfacing Behaviormentioning

confidence: 99%

Respiratory metabolism of mosquitofish, Gambusia affinis: effects of temperature, dissolved oxygen, and sex difference

et al. 1985

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SynopsisRoutine respiratory metabolic rates of mosquitofish (-0.2g live weight) were determined at 10, 15,20,25, 30, and 35°C at normoxic, hypoxic (= 40 torr P@), and extreme hypoxic (= 25 torr P@) conditions. Rates generally increased with increases in temperature (overall Q,, = 2.11 at normoxia). Significant depressions (P<0.05) in rates were measured at 30 and 35°C at extreme hypoxic conditions. Males exhibited higher mortality at extreme hypoxia than females, especially at 35" C. Metabolic rates were significantly elevated at hyperoxic conditions (= 300 torr P@) at 25 and 30" C, but not at 35°C. Resting routine rates of less-confined fish were determined at 20,25, and 30" C at normoxia and were significantly lower than the routine rates at the same temperatures. Behavioral experiments showed that aquatic surface respiration is initiated by mosquitofish at -20-65 torr Po, and is obligatory below 20 torr at 20" C. Overall, respiratory metabolic rates provide a quantitative metabolic basis from which predation rates of mosquitofish in various environments can be estimated.

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Section: Surfacing Behaviormentioning

confidence: 99%

Respiratory metabolism of mosquitofish, Gambusia affinis: effects of temperature, dissolved oxygen, and sex difference

et al. 1985

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“…Although a fall in organic phosphates will diminish the size of the Bohr effect , the presence of a significant Bohr shift is consistent with successful hypoxic adaptation (Cech et al 1979). Both a pronounced Bohr effect and a large Root shift are seen in catfish adapted to hypoxia (Albers et al 1981).…”

Section: Discussionmentioning

confidence: 79%

“…Several other studies document a consistent response of fish to hypoxia by increasing 0, affinity (Wood & Johansen 1972, Wood et al 1975, Weber & Lykkeboe 1978, Cech et al 1979, Soivio et al 1980. Although a fall in organic phosphates will diminish the size of the Bohr effect , the presence of a significant Bohr shift is consistent with successful hypoxic adaptation (Cech et al 1979).…”

Section: Discussionmentioning

confidence: 81%

“…Helcogrumma also possesses a Root effect, although as with the case for some other species lacking a swim bladder, the Root shift may operate through the choroid rete mirabile to generate high ocular pressures. A Root effect is also present in several bimodal airbreathing fishes (Farmer et al 1979) and in species such as eels, catfish and tenth which thrive in water with reduced PO, (Albers et al 1981, Breepoel et al 1981, Jensen & Weber 1982 though not in others such as the blackfish (Cech et al 1979). It is interesting in this respect that in common with Helcogramma, both eels (Berg & Steen 1965) and catfish (Hughes & Singh 1971) have reduced v02 during air breathing.…”

Section: Discussionmentioning

confidence: 97%

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Respiration and oxygen transport functions of the blood from an intertidal fish, Helcogramma medium (Tripterygiidae)

Innes

Wells

1985

Environ Biol Fish

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Aquatic and aerial oxygen uptake (VO,), ventilation frequency, and oxygen transport properties of the blood were determined for the intertidal fish Helcogramma medium. Ventilation frequency increased in response to decreased environmental PO, and aquatic VOZ was maintained down to a critical PO, of 30-40 mm Hg. Below PO, = 30mmHg fish intermittently gulped air and finally emerged into air at PO, = 18mm Hg. After 1 h exposure to air V02 decreased to 60% of the aquatic rate and this was accompanied by an increase in blood lactate. Aerobic expansibility was reduced in air (~1.2) compared to water (x5.5). The Hb concentration was 0.47 + 0.13mmoll-' and hematocrit 11.55 IfI 3.61% indicating a moderate O,-carrying capacity. Oxygen affinity was not especially high (P,,, = 19 mm Hg at pH 7.7 and 1S'C) and ATP was the predominant acid-soluble phosphate regulating P,,,. The equilibrium curve was essentially hyperbolic (Hill's y1= 1.2) with a marked Bohr effect (@ = -1.06) and Root effect (saturation depressed by 50% at pH7.1). The pattern of respiration and the respiratory properties of the blood together with observations of the behaviour of the fish during aerial exposure indicated that Helcogramma is adapted to living in a well-aerated environment yet can adequately tolerate short term exposure to low aquatic PO, or air.

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“…At constant temperature, decreases in oxygen consumption are achieved primarily by avoiding activity. One such example, the Sacramento blackfish Orthodon microlepidotus, exhibits significant metabolic depression over a wide range of temperature when exposed to hypoxic conditions (Cech et al, 1979). We made no measurements of metabolic rate during this investigation.…”

Section: Whole Blood Oxygen Affinitymentioning

confidence: 99%

Physiological responses to prolonged aquatic hypoxia in the Queensland lungfish Neoceratodus forsteri

Kind

Grigg

Booth

2002

Respiratory Physiology & Neurobiology

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Respiratory adaptations of sacramento blackfish, Orthodon microlepidotus (ayres), for hypoxia

Cited by 16 publications

References 16 publications

Respiratory metabolism of mosquitofish, Gambusia affinis: effects of temperature, dissolved oxygen, and sex difference

Respiratory metabolism of mosquitofish, Gambusia affinis: effects of temperature, dissolved oxygen, and sex difference

Respiration and oxygen transport functions of the blood from an intertidal fish, Helcogramma medium (Tripterygiidae)

Physiological responses to prolonged aquatic hypoxia in the Queensland lungfish Neoceratodus forsteri

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