Sodium exchanges in goldfish (Carassius auratus L.) adapted to a hypertonic saline solution

Lahlou, B.; Henderson, Ian; Sawyer, Wilbur H.

doi:10.1016/0010-406x(69)90580-5

Cited by 57 publications

(25 citation statements)

References 6 publications

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“…The abnormal fluid content observed in the posterior intestine could be sea water ingested, not desalted in the oesophagus and diluted by osmotic losses from tissues. Water ingestion is induced in fish, even in stenohaline freshwater fishes (Lahlou et al, 1969), by the transfer to a hypertonic medium (Hirano, 1974). The two-step scheme of the mechanism responsible for water recovery in teleosts cannot apply to sturgeons: from these preliminary observations it is not possible to say how water balance, that took place somehow as the fishes did survive, is carried out in the sturgeons.…”

Section: Discussionmentioning

confidence: 99%

Acclimation trials of juvenile Italian sturgeon to different salinities: morpho‐physiological descriptors

Cataldi

Ciccotti

DiMarco

et al. 1995

Journal of Fish Biology

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In this study the first experimental trials of acclimation to salinities of the Italian sturgeon Acipenser naccarii are described. Preliminary observations regarding some morphological features of the gut, kidney and gills following exposure to 20 and 30‰ salinity are reported, and compared with those displayed by many teleosts in hyper-and hypoosmoregulation. Results are discussed with regard to the osmoregulatory mechanisms and to the physiological limits of adaptability of this species in the second year of its life cycle. Within the Acipenseridae, Acipenser naccarii is generally considered a euryhaline species, but nothing is known about its mechanisms of osmotic homeostasis. This species could be a good candidate for aquaculture in fresh and brackish waters owing to the recent success obtained in artificial reproduction.1995 The Fisheries Society of the British Isles

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Section: Discussionmentioning

confidence: 99%

Acclimation trials of juvenile Italian sturgeon to different salinities: morpho‐physiological descriptors

Cataldi

Ciccotti

DiMarco

et al. 1995

Journal of Fish Biology

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show abstract

“…At high salinities the plasma Na concentration rises to equal that of the external medium; Na is excreted across the gills, whilst the flow of urine decreases (Lahlou, Henderson & Sawyer, 1969). Intestinal absorption, measured in vitro using the everted sac technique, is much lower in saltadapted goldfish than in fish swimming in fresh water (Ellory, Lahlou & Smith, 1971, 1972.…”

Section: Introductionmentioning

confidence: 99%

The effect of salt adaptation on the permeability and cation selectivity of the goldfish intestinal epithelium

Ellory¹,

Nibelle²,

Smith³

1973

The Journal of Physiology

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SUMMARY1. The short-term uptake of Na by the goldfish mucosa was compared using both inulin and choline as markers of extracellular space. The results were virtually identical, the distribution of both choline and inulin increasing rapidly to measure a space at 1 min which then remained nearly constant during a following 4 min incubation.2. Using inulin as space marker, the uptake of various alkali metal cations was determined from a 1 min contact with the mucosa. The relative rates of uptake were Ti > K > Rb > Cs > Na > Li, with a low selectivity ratio, the range of permeabilities being no greater than 5. 3. The selectivity sequence was the same in both salt and fresh-water adapted fish. Of the alkali metal cations tested, only Na showed a significantly decreased uptake on adaptation to salt.4. Isolated intestinal preparations from salt-adapted fish showed a reduced short-circuit current compared with fish adapted to fresh water, the values being 12-3 + 12 and 35-7 + 1P5 ,sA cm-2 respectively. In both cases the short-circuit current was equivalent to the net transport of Na measured isotopically.5. In Krebs-Henseleit medium, the measured tissue resistance was approximately 100 Q cm-2 for both salt and fresh-water adapted fish.6. It is concluded that regulation of cation transport in goldfish intestinal epithelium is specific for Na and mediated primarily through cellular rather than extracellular pathways.

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“…The sodium concentration in this medium closely resembled that found in the blood of goldfish kept in fresh water (Lahlou, Henderson & Sawyer, 1969). Cleaned gallbladders were cannulated and filled with 50 to 100 laliters of physiological saline and then incubated in identical medium gassed with O z.…”

Section: Measurement Of Fluid Transportmentioning

confidence: 99%

Temperature-dependent changes in fluid transport across goldfish gallbladder

1973

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Summary. The temperature dependence of fluid transport across in vitro preparations of goldfish gallbladder was measured using a gravimetric technique. Fluid transport showed a direct dependence on incubation temperature when the adaptation temperature was kept constant. For constant incubation temperature, transport fell as the adaptation temperature rose. The width of intercellular channels varied with incubation and adaptation temperature as expected if fluid were to cross the tissue by this route. The structure of the gallbladder was otherwise unaffected by changes of temperature. Intracellular concentrations of Na, K and C1 also depended on the environmental temperature of the fish. The levels of Na and C1 increased and the level of K decreased, at constant incubation temperature, as the adaptation temperature rose from 8 to 30 ~ These changes took two to three weeks to become apparent while fluid transport regulated within 20 hours of raising the environmental temperature. The osmotic permeability of the gallbladder remained independent of both incubation and adaptation temperature.The outcome of adaptation was to maintain constant both the ionic composition of the epithelium and the rate at which it could transport fluid, when these parameters were measured at incubation temperatures equal to the previous environmental temperature of the fish. The significance of these findings is discussed and a mechanism for regulation postulated which involves an initial regulation of salt entry into the rnucosa followed by long term changes in the pumping ability of newly synthesized cells.The mechanism whereby water is removed from bile held within the gallbladder is now understood in some detail, thanks largely to the work of Diamond and his co-workers (see the review of Diamond, 1968). The active extrusion of salt into intercellular channels creates a standing osmotic gradient which then provides the driving force for fluid movement

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Sodium exchanges in goldfish (Carassius auratus L.) adapted to a hypertonic saline solution

Cited by 57 publications

References 6 publications

Acclimation trials of juvenile Italian sturgeon to different salinities: morpho‐physiological descriptors

Acclimation trials of juvenile Italian sturgeon to different salinities: morpho‐physiological descriptors

The effect of salt adaptation on the permeability and cation selectivity of the goldfish intestinal epithelium

Temperature-dependent changes in fluid transport across goldfish gallbladder

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