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Interaction of short-term testosterone treatment with osmotic acclimation in the gilthead sea bream Sparus auratus
Arjona, F.J.; Sangiao-Alvarellos, S.; Polakof, S.; García-López, A.; Martin del Rio, M.P.; Martínez-Rodríguez, G.; Soengas, J.L.; Mancera, J.M. (2008). Interaction of short-term testosterone treatment with osmotic acclimation in the gilthead sea bream Sparus auratus. Mar. Biol. (Berl.) 153(4): 661-671.
In: Marine Biology. Springer: Heidelberg; Berlin. ISSN 0025-3162; e-ISSN 1432-1793, more
Peer reviewed article  

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  • Arjona, F.J.
  • Sangiao-Alvarellos, S.
  • Polakof, S.
  • García-López, A.
  • Martin del Rio, M.P.
  • Martínez-Rodríguez, G.
  • Soengas, J.L.
  • Mancera, J.M.

    To assess the interaction between testosterone (T) treatment and acclimation to different salinities, seawater-acclimated gilthead sea bream (Sparus auratus) were implanted with slow-release coconut oil implants alone (control) or containing T (5 µg/g body mass). After 5 days, eight fish of control and T-treated groups were sampled. The same day, eight fish of each group were transferred to low salinity water (LSW, 6 ppt, hypoosmotic test), seawater (SW, 38 ppt, control test) and high salinity water (HSW, 55 ppt, hyperosmotic test) and sampled 9 days later. Gill Na+, K+-ATPase activity increased in HSW-acclimated fish with respect to SW- and LSW-acclimated fish in both control and T-treated groups. Kidney Na+, K+-ATPase activity was also enhanced in HSW-acclimated fish, but only in T-treated group. From a metabolic point of view, most of the changes observed can be attributed to the action of salinity and T treatment alone, since few interactions between T treatment and osmotic acclimation to different salinities were observed. Those interactions included in treated fish: in the liver, decreased capacity in using glucose in fish acclimated to extreme salinities; in the gills, decreased capacity in using amino acids in HSW; in the kidneys increased capacity in using amino acids in extreme salinities; and in the brain, decreased glycogen and acetoacetate levels of fish in LSW.

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