Les Hormones dans l’Osmoregulation des Poissons

Lahlou, B.

doi:10.1007/978-1-4899-3659-2_8

Cited by 11 publications

(7 citation statements)

References 146 publications

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“…Nevertheless, these responses are absent in plasma volume increase. On the other hand, intestinal water reabsorption in marine teleost species is controlled by cortisol (Lahlou, 1980). Therefore, the increase in cortisol levels could induce a higher water reabsorption which, in turn, can be reflected by a decrease in some haematological parameters, as was found here.…”

Section: Discussionsupporting

confidence: 72%

Effects of daily management stress on haematology and blood rheology of the gilthead seabream

PagÉes¹,

Gómez

Süner

et al. 1995

Journal of Fish Biology

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Haematological and haemorheological responses against a moderate management stress, applied for 2 weeks, have been studied in the gilthead seabream (Sparus aurata). The stress application leads to a significant reduction in circulating erythrocytes, which caused decreased blood viscosity. Although erythrocyte osmotic fragility showed a trend inversely related to the duration of management stress, no significant change in cell dimensions, aggregation and deformation indices was observed. Consequently, the decrease in oxygen transport capacity attributable to haematocrit reduction, is not compensated by a qualitative change in the microrheological behaviour of erythrocytes, since the blood viscosity decreases as a direct result of the decline in red blood cell number.

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Section: Discussionsupporting

confidence: 72%

Effects of daily management stress on haematology and blood rheology of the gilthead seabream

PagÉes¹,

Gómez

Süner

et al. 1995

Journal of Fish Biology

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“…In general, stress will induce changes in the metabolic rate (Barton & Schreck 1978) and the hydromineral balance (Schreck 1981), for example, by its effect on the rate of sodium exchange across the branchial epithelium (e.g. Evans 1980, Lahlou 1980. If glycolysis becomes anaerobic, due to an increase in the metabolic rate, it will ultimately cause an increase in the lactic acid content of the blood and tissues (e.g.…”

Section: Introductionmentioning

confidence: 98%

Synergistic effect on mortality in Atlantic salmon, Salmo salar, smolt caused by osmotic stress and presence of predators

Järvi

1989

Environ Biol Fish

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SynopsisThe hypothesis that an increase in the mortality rate of Atlantic salmon would be produced by the synergistic effect of osmotic stress and of stress due to the presence of predators was tested by putting two groups of smolts (one acclimated to seawater and the other not acclimated) into a tank containing predators. These smolts were tested afterwards in a seawater-challenge test, together with smolts of the control groups for both experimental groups. The mortality rate of the non-acclimated and predator-exposed smolts was 90%) and that of the seawater acclimated and predator-exposed smolts 43%) compared to no mortality among the control groups. Lack of acclimation to seawater did not in itself induce any lethal stress, but in conjunction with predator-stress there was a synergistic effect, leading to an increase in the mortality rate. The hypothesis is therefore considered to be valid.

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“…Morphological changes in chloride cells during fish adaptation to seawater or to freshwater are under con-0 1993 WILEY-LISS. INC. trol of both external and hormonal factors (Lahlou, 1980;Foskett et al, 1983;Mayer-Gostan et al, 1987). Following the original finding by Pickford and Phillips (1959) stressing the necessary presence of prolactin (PRL) for survival of hypophysectomized Fundulus in fresh water, the role of this hormone in freshwater osmoregulation has been established in several euryhaline species including the tilapia Oreochromis mossambicus.…”

mentioning

confidence: 99%

Effects of prolactin on α and β chloride cells in the gill epithelium of the saltwater adapted tilapia “Oreochromis niloticus”

et al. 1993

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Tilapia (Oreochromis niloticus), 21 g average body weight, were divided into two groups. A group was maintained in fresh water, whereas another group was adapted for 2 weeks to 20% salt water. Among the latter, fishes were injected every 2 days for a week with tilapia prolactin (ti-PRL I). Gills were prepared for electron microscopy in order to determine the types and surface areas of chloride cells in each experimental condition. Two types of chloride cells, the alpha and beta cells were easily distinguished on the basis of their location and ultrastructural features in the gills of freshwater fishes, while only one type of cell, the saltwater alpha cells presumably derived from the transformation of the freshwater alpha cells, were encountered in saltwater adapted animals. After PRL injection of saltwater adapted fishes, small chloride cells, which displayed ultrastructural features similar to those of beta cells in freshwater tilapia, reappeared in interlamellar regions of the gills. In the same experimental conditions, the voluminous saltwater alpha cells showed a tendency to resume ultrastructural features more characteristic of the freshwater alpha cells from which they were derived. These observations tend to indicate that prolactin behaves as a "freshwater adapting hormone" and that beta cells are specifically involved in fish adaptation to freshwater living conditions.

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Les Hormones dans l’Osmoregulation des Poissons

Cited by 11 publications

References 146 publications

Effects of daily management stress on haematology and blood rheology of the gilthead seabream

Effects of daily management stress on haematology and blood rheology of the gilthead seabream

Synergistic effect on mortality in Atlantic salmon, Salmo salar, smolt caused by osmotic stress and presence of predators

Effects of prolactin on α and β chloride cells in the gill epithelium of the saltwater adapted tilapia “Oreochromis niloticus”

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