Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/43069
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Título : Arginine vasotocin, isotocin and melatonin responses following acclimation of gilthead sea bream (Sparus aurata) to different environmental salinities
Autor : Kleszczyńska, Agnieszka, Vargas-Chacoff, Luis, Gozdowska, M., Kalamarz, Hanna, Martínez-Rodríguez, Gonzalo, Mancera, Juan Miguel, Kulczykowska, Ewa
Palabras clave : Arginine vasotocin
Gilthead sea bream
Hormones
Isotocin
Melatonin
Neurohypophysis
Osmoregulation
Salinity
Fecha de publicación : 29-Jun-2006
Editor: Elsevier
Citación : Comparative Biochemistry and Physiology - A - Molecular and Integrative Physiology 145(2): 268-273 (2006)
Resumen: Gilthead sea bream (Sparus aurata) is a euryhaline species with a capacity to cope with demands in a wide range of salinities and thus is a perfect model-fish to study osmoregulatory responses to salinity-adaptive processes and their hormonal control. Immature sea bream acclimated to different salinities, i.e. SW (38‰), LSW (5‰) and HSW (55‰), were kept at 18 °C under natural photoperiod. Arginine vasotocin (AVT) and isotocin (IT) in plasma and pituitary were determined by HPLC. Plasma melatonin (Mel) was assayed by RIA. Plasma osmolality, ion concentrations (Na+, K+, Ca2+, Cl−) and Na+,K+-ATPase activity in gill were measured. A steady increase in plasma AVT, along with increasing water salinity was observed. Pituitary IT concentration in HSW-acclimated fish was significantly higher than that in LSW group. AVT/IT secretory system of sea bream does appear to be involved in the mechanism of long-term acclimation to different salinities. The distinct roles and control mechanisms of both nonapeptides are suggested. Plasma Mel was significantly higher in LSW compared with both HSW and SW groups. Data indicate that the changes in Mel level are linked to osmoregulation. Further studies are required to elucidate a complex role of AVT, IT and Mel in sea bream osmoregulation.
Descripción : 7 páginas, 2 figuras, 3 tablas.
Versión del editor: http://dx.doi.org/10.1016/j.cbpa.2006.06.037
URI : http://hdl.handle.net/10261/43069
ISSN: 1095-6433
DOI: 10.1016/j.cbpa.2006.06.037
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