Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/3844
Título: Calcium handling in Sparus auratus: effects of water and dietary calcium levels on mineral composition, cortisol and PTHrP levels
Autor: Abbink, W.
Bevelander, G. S.
Rotllant, J.
Canario, Adelino V. M.
Flik, G.
Palavras-chave: Hypocalcemia
Calcium balance
Data: 1-Nov-2004
Editora: The Company of Biologists
Citação: Abbink, W.; Bevelander, G. S.; Rotllant, J.; Canario, A. V. M.; Flik, G.Calcium handling in Sparus auratus: effects of water and dietary calcium levels on mineral composition, cortisol and PTHrP levels, Journal of Experimental Biology, 207, 23, 4077-4084, 2004.
Resumo: Juvenile gilthead sea bream (Sparus auratus L.; 10–40·g body mass) were acclimatized in the laboratory to full strength (34‰) or dilute (2.5‰) seawater and fed normal, calcium-sufficient or calcium-deficient diet for nine weeks. Mean growth rate, whole-body calcium and phosphorus content and accumulation rates were determined, as well as plasma levels of ionic and total calcium, cortisol and parathyroid hormone related protein (PTHrP; a hypercalcemic hormone in fish). When confronted with limited calcium access (low salinity and calcium-deficient diet), sea bream show growth arrest. Both plasma cortisol and PTHrP increase when calcium is limited in water or diet, and a positive relationship was found between plasma PTHrP and plasma ionic calcium (R2=0.29, N=18, P<0.05). Furthermore, a strong correlation was found between net calcium and phosphorus accumulation (R2=0.92, N=16, P<0.01) and between body mass and whole-body calcium (R2=0.84, N=25, P<0.01) and phosphorus (R2=0.88, N=24, P<0.01) content. Phosphorus accumulation is strongly calcium dependent, as phosphorus accumulation decreases in parallel to calcium accumulation when the diet is calcium deficient but phosphorus sufficient. We conclude that PTHrP and cortisol are involved in the regulation of the hydromineral balance of these fish, with growthrelated calcium accumulation as an important target.
Peer review: yes
URI: http://hdl.handle.net/10400.1/3844
DOI: http://dx.doi.org/10.1242/jeb.01254
ISSN: 0022-0949
Versão do Editor: http://jeb.biologists.org/content/207/23/4077.full.pdf+html
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