7 documents found, page 1 of 1
Francisella noatunensis modulates the hepatic profile of fatty acids in Patagon...
Oyarzún-Salazar, R.; Lagos, Carolina; Orellana, P.; Dantagnan, P.; Muñoz, J.L.P.; Romero, A.; Vargas-Chacoff, L.Fatty acids (FA) have been reported to play a role in the defense against bacterial pathogens. However, studies in fish are limited and no information exists on the modulation of FA of Eleginops maclovinus challenged with the pathogen of aquaculture relevance Francisella noatunensis. We inoculated 144 fish intraperitoneally with 3 doses (low dose [LD]: 1 x 101 bact/mu L; medium dose [MD]: 1 x 105 bact/mu L; hig...
Characterization of the peripheral thyroid system of gilthead seabream acclimat...
Ruiz-Jarabo, I.; Klaren, P. H. M.; Louro, Bruno; Martos-Sitcha, J. A.; Pinto, P. I.; Vargas-Chacoff, L.; Flik, G.; Martinez-Rodriguez, G.Thyroid hormones are involved in many developmental and physiological processes, including osmoregulation. The regulation of the thyroid system by environmental salinity in the euryhaline gilthead seabream (Sparus aurata) is still poorly characterized. To this end seabreams were exposed to four different environmental salinities (5, 15, 40 and 55 ppt) for 14 days, and plasma free thyroid hormones (fT3, ff4), ou...
Metabolic responses to salinity changes in the subantarctic notothenioid teleos...
Vargas-Chacoff, L.; Moneva, F.; Oyarzun, R.; Martinez, D.; Saavedra, E.; Ruiz-Jarabo, I.; Munoz, J. L. P.; Bertran, C.; Mancera, J. M.Eleginops maclovinus is an endemic, subantarctic Notothenioidei species. This study examined the influence of different environmental salinities (5, 15, and 45 psu; and 32 psu as a control) on energy metabolism in E. maclovinus over a period of 14 days. Metabolite contents and enzymatic activities related to carbohydrate, amino acid, and lipid metabolisms were evaluated in metabolic (liver) and osmoregulatory (...
Different environmental temperatures affect amino acid metabolism in the euryth...
Costas, B.; Aragão, C.; Ruiz-Jarabo, I.; Vargas-Chacoff, L.; Arjona, F. J.; Mancera, J. M.; Dinis, Maria Teresa; Conceição, L. E. C.Senegalese sole (Solea senegalensis) is a eurytherm teleost that under natural conditions can be exposed to annual water temperature fluctuations between 12 and 26C. This study assessed the effects of temperature on sole metabolic status, in particular in what concerns plasma free amino acid changes during thermal acclimation.
Physiological short-term response to sudden salinity change in the Senegalese s...
Herrera, M.; Aragão, C.; Hachero-Cruzado, Ismael; Ruiz-Jarabo, I.; Vargas-Chacoff, L.; Mancera, J. M.; Conceição, L. E. C.The physiological responses of Senegalese sole to a sudden salinity change were investigated. The fish were first acclimated to an initial salinity of 37.5 ppt for 4 h. Then, one group was subjected to increased salinity (55 ppt) while another group was subjected to decreased salinity (5 ppt). The third group (control group) remained at 37.5 ppt. We measured the oxygen consumption rate, osmoregulatory (plasma o...
Feed deprivation in Senegalese sole (Solea senegalensis Kaup, 1858) juveniles: ...
Costas, B.; Aragão, C.; Ruiz-Jarabo, I.; Vargas-Chacoff, L.; Arjona, F. J.; Dinis, Maria Teresa; Mancera, J. M.; Conceição, L. E. C.The effects of prolonged feed deprivation were assessed on blood plasma metabolites and free amino acid levels in Solea senegalensis. Juvenile specimens were maintained at two experimental conditions (24 h fasted and 21 days feed-deprived). In feed-deprived fish, relative growth rate and hepatosomatic index as well as plasma triglycerides and proteins levels were significantly lower.
Changes in plasma amino acid levels in a euryhaline fish exposed to different e...
Aragão, C.; Costas, B.; Vargas-Chacoff, L.; Ruiz-Jarabo, I.; Dinis, Maria Teresa; Mancera, J. M.; Conceição, L. E. C.Previous studies have shown that Senegalese sole is partially euryhaline in the juvenile phase, being able to adapt to a wide range of salinities in a short-time period, due to changes at the osmoregulatory and metabolic level. This study aimed to assess the effects of acclimation of sole to a wide range of salinities, with a special emphasis on the role of plasma amino acids during this process. Sole juveniles...