Gill blood flow and ammonia excretion in the marine teleost, Myoxocephalus scorpius

Goldstein, Léon; Forster, Roy P.; Fanelli, George M.

doi:10.1016/0010-406x(64)90151-3

Cited by 90 publications

(15 citation statements)

References 15 publications

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“…Although only 1% of the ammonia is in the non-ionized form at the surface ofthe cell membrane, this is not areal problem because of the rapid conversion of NH4 + to NH3 , which can diffuse from the extra-cellular body fluid into the gill and from the gill epithelial cells into the water. Goldstein, Forster, and Fanelli (1964) found that approximately 60% ofthe ammonia excreted from the gill of Myoxocephalus scorpius was from blood ammonia, while 40% was from plasma amino acids that were deaminated in the gill tissue.…”

Section: Metabolism Of Amino Acidsmentioning

confidence: 98%

Nutrition and Feeding of Fish

Lovell

1989

658

257

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Section: Metabolism Of Amino Acidsmentioning

confidence: 98%

Nutrition and Feeding of Fish

Lovell

1989

658

257

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“…Evidence also exists for NH4 + excretion in exchange for H + or Na ÷ (Evans, 1977;Goldstein et aL, 1982;Evans and More, 1988). Urea excretion from the head region of marine teleosts is low (Sayer and Davenport, 1987), and negligible across the gills of at least one marine teleost (Goldstein et al, 1964). Urea has a low oil-water partition coefficient and therefore will not diffuse readily across fish gills (Forster and Goldstein, 1969).…”

Section: Routes Of Nitrogenous Excretion In Marine Fishmentioning

confidence: 99%

Nitrogen pollution in mariculture: toxicity and excretion of nitrogenous compounds by marine fish

Handy

Poxton

1993

Rev Fish Biol Fisheries

201

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“…Cardiac output for short-horned sculpin under normoxic conditions (25.5±5.3·ml·min ; Goldstein et al, 1964). Hypoxic bradycardia was accompanied by a similar 65% decline in cardiac output, to a minimum of 8.8·ml·min…”

mentioning

confidence: 92%

Cardiorespiratory and tissue adenosine responses to hypoxia and reoxygenation in the short-horned sculpinMyoxocephalus scorpius

MacCormack

Driedzic

2004

Journal of Experimental Biology

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SUMMARY Adenosine is a product of adenylate phosphate breakdown that can exert protective effects on tissues during energy limitation. Accumulation of cardiac adenosine under hypoxia is well documented in mammals but has not been shown in fish. Adenosine content was measured in heart and brain tissue from short-horned sculpin Myoxocephalus scorpius L. exposed to acute hypoxia and to graded hypoxia and reoxygenation at 8°C. Cardiorespiratory parameters were recorded along with plasma lactate, K+,Ca2+ and Na+ levels and their relationship to adenosine levels investigated. Sculpin exhibited a large bradycardia during hypoxia,with a concomitant drop in cardiac output that recovers fully with reoxygenation. Ventilation rate also declined with hypoxia, suggesting a depression of activity. Plasma lactate concentration was significantly elevated after 4 h at 2.0 mg l-1 dissolved oxygen while K+ levels increased during acute hypoxia. Adenosine levels were maintained in heart under acute and graded hypoxia. Brain levels fluctuated under hypoxia and showed no change with reoxygenation. It is concluded that a depression of cardiac activity in conjunction with an adequate anaerobic metabolism allow sculpin to avoid excessive adenosine accumulation under conditions of moderate hypoxia. Cardiac adenosine levels decreased and plasma K+ levels and heart rate increased significantly at reoxygenation.

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Gill blood flow and ammonia excretion in the marine teleost, Myoxocephalus scorpius

Cited by 90 publications

References 15 publications

Nutrition and Feeding of Fish

Nutrition and Feeding of Fish

Nitrogen pollution in mariculture: toxicity and excretion of nitrogenous compounds by marine fish

Cardiorespiratory and tissue adenosine responses to hypoxia and reoxygenation in the short-horned sculpinMyoxocephalus scorpius

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