Feeding and osmoregulation: dual function of the marine teleost intestine
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چکیده
منابع مشابه
Feeding and osmoregulation: dual function of the marine teleost intestine.
Experiments on Gulf toadfish Opsanus beta demonstrate how feeding impacts osmoregulation in the marine teleost intestine. A high Ca(2+) diet of pilchards Sardina pilchardus ([Ca(2+)]=404.2 mmol kg(-1)) was compared to a low Ca(2+) diet of common squid Loligo forbesi ([Ca(2+)]=1.3 mmol kg(-1)), as high [Ca(2+)] has been shown to stimulate intestinal anion exchange. Gastrointestinal fluids and bl...
متن کاملOuabain-sensitive bicarbonate secretion and acid absorption by the marine teleost fish intestine play a role in osmoregulation.
The gulf toadfish (Opsanus beta) intestine secretes base mainly in the form of HCO3- via apical anion exchange to serve Cl- and water absorption for osmoregulatory purposes. Luminal HCO3- secretion rates measured by pH-stat techniques in Ussing chambers rely on oxidative energy metabolism and are highly temperature sensitive. At 25 degrees C under in vivo-like conditions, secretion rates averag...
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SYNOPSIS. As the primary link between environmental change and physiological response, the neuroendocrine system is a critical part of osmoregulatory adaptations. Cortisol has been viewed as ‘the’ seawater-adapting hormone in fish and prolactin as ‘the’ fresh water adapting hormone. Recent evidence indicates that the growth hormone/insulin-like growth factor I axis is also important in seawater...
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Teleost fish osmoregulation is largely the result of integrated transport activities of the gill, gut and renal system. The basic 'epithelial fabric' in each of these tissues is adapted to provide the appropriate transport mechanisms depending upon whether the fish is in fresh water or sea water. Net NaCl transport by the branchial epithelium reverses direction when euryhaline species migrate b...
متن کاملOsmoregulation in marine mammals.
Osmoregulation in marine mammals has been investigated for over a century; however, a review of recent advances in our understanding of water and electrolyte balance and of renal function in marine mammals is warranted. The following topics are discussed: (i) kidney structure and urine concentrating ability, (ii) sources of water, (iii) the effects of feeding, fasting and diving, (iv) the renal...
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ژورنال
عنوان ژورنال: Journal of Experimental Biology
سال: 2006
ISSN: 1477-9145,0022-0949
DOI: 10.1242/jeb.02342