Quelques Caractéristiques Biologiques De «Lophius Piscatorius L.»

Brull, L; Cuypers, Y

doi:10.3109/13813455409145369

Cited by 11 publications

(5 citation statements)

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“…Although the skin as a whole provides no active mechanism of protection or regulation in adverse environments, its integrity is important in maintaining internal stability. Impaired osmotic control results if the mucous coat is not intact, for example, in young elvers of Anguilla anguilla (Boucher-Firly, 1932), or in the blenny (Blennius pholis) in sea water (Raffy, 1949); and in 'diuresis' after handling (Grafflin, 1931; Pitts, 1934;Brull & Cuypers, 1954). However, the skin as a whole reacts to salinity changes in a purely passive manner, losing water and increasing in salt concentration in high salinities, and becoming more hydrated in fresh water (Pora, 1939).…”

Section: Osmotic Adaptation In Fishes 395mentioning

confidence: 99%

“…pungitius (Gueylard, 1924).The presence of calcium in the water influences the tolerance of fish to downward salinity changes (Heuts, 1944; Breder, 1933), probably through the influence of the divalent ion on permeability (Solomon, 1961).Although the skin as a whole provides no active mechanism of protection or regulation in adverse environments, its integrity is important in maintaining internal stability. Impaired osmotic control results if the mucous coat is not intact, for example, in young elvers of Anguilla anguilla (Boucher-Firly, 1932), or in the blenny (Blennius pholis) in sea water (Raffy, 1949); and in 'diuresis' after handling (Grafflin, 1931; Pitts, 1934;Brull & Cuypers, 1954). However, the skin as a whole reacts to salinity changes in a purely passive manner, losing water and increasing in salt concentration in high salinities, and becoming more hydrated in fresh water (Pora, 1939).The African lung-fish Protopterus aethiopicus has a permeability problem unique amongst fishes of resisting dehydration during the summer months of drought.…”

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Osmotic Adaptation in Fishes

Parry

1966

Biological Reviews

168

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Section: Osmotic Adaptation In Fishes 395mentioning

confidence: 99%

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confidence: 99%

Osmotic Adaptation in Fishes

Parry

1966

Biological Reviews

168

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“…In a former paper (Brull & Cuypers, 1954) we gave figures showing an average of 12'1 mg/IOO ml. (from 6'32 up to 16'7), in fish bled on arrival in the laboratory, and also one figure of 6'5 mg in a fish bled on board immediately after capture.…”

Section: Discussionmentioning

confidence: 99%

“…The problem was studied with isolated kidneys perfused with heparinized blood, according to the method described by Brull & Cuypers (1954). As we demonstrated that there is a maximum or optimum perfusion pressure above which no further increase of urine secretion is obtained (250-300 rom water), our perfusions were made at pressures of about 250-300 rom of water, at room temperatUreand with oxygenatedblood (in July-August).…”

Section: Methodsmentioning

confidence: 99%

“…

The kidney of Lophiuspossessesa high power for concentratingmagnesium, to a degree approaching a hundred-fold.

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Blood perfusion of the kidney ofLophius piscatoriusL. IV. Magnesium excretion

Brull¹,

Cuypers²

1955

J. Mar. Biol. Ass.

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From our previous publications Brull, Nizet &Verney, 1953;Brull &Cuypers, 1954),it appears that the power of concentration of the aglomerular kidney of Lophius is rather low, the density of the urine being usually less than that of the plasma concentration. Most individual urinary constituents do not reach concentrations that are more than once or twice those in the plasma, magnesium being an exception.The kidney of Lophiuspossessesa high power for concentratingmagnesium, to a degree approaching a hundred-fold. The plasma Mg usually increases after the fish has been caught, and therefore it seems likely that trauma is a factor in increased Mg absorption.2 We referred in our previous work (1953) to other authors who had already noticed that urine secreted by Lophiusin the aquarium is not the same as that secreted by fishesliving under normal conditions. Yet, as Lophius kidneys are endowed with a particular power for excreting Mg, we thought it would be interesting to investigate this function further. What is the normal amount of Mg in Lophiusplasma? Is it higher or similar to the figuresfound in mammals? Is there a threshold belowwhich the secretion stops? Is exogenousMg excreted in the same manner as the Mg that enters the blood stream through normal channels? These are the first questions which arise and seem worthy of investigation. METHODSThe problem was studied with isolated kidneys perfused with heparinized blood, according to the method described by Brull & Cuypers (1954). As we demonstrated that there is a maximum or optimum perfusion pressure above which no further increase of urine secretion is obtained (250-300 rom water), our perfusions were made at pressures of about 250-300 rom of water, at 1 With the collaboration of A. Dujardin, L. Dubois and L. Wilsens. 2 In dialysis experiments on Lophius skin E. Nize1(unpublished) found that rubbing the skin increases its permeability to minerals.

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Composition of bladder urine of the coelacanth, Latimeria chalumnae

et al. 1976

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Major inorganic electrolytes and organic solutes were measured in urine obtained from the bladder of a live specimen of the coelacanth, Latimeria chalumnae, and the results were compared with data on blood serum from the same fish. Osmolarity is essentially identical in the two fluids. Magnesium, phosphate, sulfate, creatine, creatinine and glucuronate are highly concentrated in the urine whereas chloride, bicarbonate, protein and glucose are much lower in urine than in serum. There are moderately higher levels of potassium, total amino acids and total carbohydrates and somewhat lower concentrations of sodium, trimethylamine oxide and lactate in urine than in serum. Total calcium levels in urine are considerably lower than serum total calcium, but are slightly higher than the dialyzable calcium fraction of serum. Urea levels in urine and serum are identical.Since the discovery that the coelacanth, Latimeria chalumnae, regulates blood osmolarity close to that of sea water by maintaining high levels of urea (Pickford and Grant, '67; Lutz and Robertson, '71; Griffith et al., '74) the question has been raised whether this represents a primitive characteristic found in the common ancestor of all bony and cartilagenous fishes, a feature indicative of unique common ancestry between the coelacanth and elasmobranch fishes, or an independent development in the coelacanth and the elasmobranchs (Goldstein et al., '73; Atz, '73; Griffith et al., '74). The elasmobranch fishes maintain high blood urea through high activities of enzymes of the ornithine-urea cycle (cf. reviews by Forster and Goldstein, '69; Goldstein, '72), through restriction of urea loss across epithelial surfaces and through reabsorption of urea in the kidney (reviews by Smith, '36; Forster, '67; Hickman and Trump, '69; '72). The related chimaerid fishes appear to use similar mechanisms to achieve high concentrations of urea in the blood (Read, '71).

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Quelques Caractéristiques Biologiques De «Lophius Piscatorius L.»

Cited by 11 publications

References 5 publications

Osmotic Adaptation in Fishes

Osmotic Adaptation in Fishes

Blood perfusion of the kidney ofLophius piscatoriusL. IV. Magnesium excretion

Composition of bladder urine of the coelacanth, Latimeria chalumnae

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