Abstract
Considerable evidence indicates that branchial sodium- and potassium-activated adenosine triphosphatase (Na-K-ATPase) is essential in maintaining the high sodium turn-over rate at the gills of teleosts in sea-water (SW) (Epstein, Katz & Pickford, 1967; Motais, 1970; Pickford, Pang, Weinstein, Torretti, Hendler & Epstein, 1970). Though without effect on the low freshwater (FW) levels, hypophysectomy reduces the high branchial Na-K-ATPase in SW Fundulus heteroclitus, and prolonged cortisol treatment restores normal levels (Epstein et al. 1967; Pickford et al. 1970); parallel changes occur in the sodium turn-over rate in SW F. heteroclitus after hypophysectomy and corticotrophin (ACTH) treatment (Maetz, Sawyer, Pickford & Mayer, 1967c; Maetz, Mayer, Forster & Chan, 1967b). In the European eel, Anguilla anguilla, sodium turn-over rate is higher in SW than in FW (Maetz, Mayer & Chartier-Baraduc, 1967a). In SW it is reduced by hypophysectomy (Maetz et al. 1967a) and adrenalectomy (Mayer, Maetz, Chan, Forster &
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