Circadian studies of plasma cortisol, thyroid hormone, protein, glucose and ion concentration, liver glycogen concentration and liver and spleen weight in rainbow trout, Salmo gairdneri richardson

Effects of food deprivation on 24 h‐changes in brain and liver carbohydrate and ketone body metabolism of rainbow trout

“…The fall of lactate level at 2200 hours in plasma and liver did not occur in fasted fish, suggesting a dependency on feeding. Liver glycogen levels increased during the scotophase and decreased during the photophase in fed rainbow trout, in agreement with other studies on rainbow trout (Laidley & Leatherland, 1988), sea bass (Pérez et al, 1988) and tench (de Pedro et al, 1998) but in contrast to other studies on rainbow trout (Hilton et al, 1987; and Atlantic salmon (Soengas et al, 1996a). These increased glycogen levels may reflect that at least part of the increased plasma glucose levels post-feeding were directed to the liver to be stored as F.…”

“…Plasma glucose levels of rainbow trout were elevated after feeding, which is in agreement with most studies on teleosts including rainbow trout (Laidley & Leatherland, 1988;Boujard & Leatherland, 1992b;Boujard et al, 1993; T I. Effect of progressive fasting for up to 5 days on daily changes in the activities of potential regulatory enzymes of glycogenesis (glycogen synthetase, GSase) and glycolysis (6-phosphofructo 1-kinase, PFK; and lactate dehydrogenase, LDH) assayed in brain of rainbow trout.…”

Effects of food deprivation on 24 h‐changes in brain and liver carbohydrate and ketone body metabolism of rainbow trout

“…The fall of lactate level at 2200 hours in plasma and liver did not occur in fasted fish, suggesting a dependency on feeding. Liver glycogen levels increased during the scotophase and decreased during the photophase in fed rainbow trout, in agreement with other studies on rainbow trout (Laidley & Leatherland, 1988), sea bass (Pérez et al, 1988) and tench (de Pedro et al, 1998) but in contrast to other studies on rainbow trout (Hilton et al, 1987; and Atlantic salmon (Soengas et al, 1996a). These increased glycogen levels may reflect that at least part of the increased plasma glucose levels post-feeding were directed to the liver to be stored as F.…”

“…Plasma glucose levels of rainbow trout were elevated after feeding, which is in agreement with most studies on teleosts including rainbow trout (Laidley & Leatherland, 1988;Boujard & Leatherland, 1992b;Boujard et al, 1993; T I. Effect of progressive fasting for up to 5 days on daily changes in the activities of potential regulatory enzymes of glycogenesis (glycogen synthetase, GSase) and glycolysis (6-phosphofructo 1-kinase, PFK; and lactate dehydrogenase, LDH) assayed in brain of rainbow trout.…”

Development of a microtitre plate indirect ELISA for measuring cortisol in teleosts, and evaluation of stress responses in rainbow trout and gilthead sea bream

“…As for precision of the system, (intra‐assay CV), this was comparable with those of other ELISA systems (<3, 6·9 and 5·5%, in Barry et al ., 1993; Nielsen et al ., 1994 and Carey & McCormick, 1998, respectively). Both reproducibility and precision were also similar to those obtained in RIA‐based systems (Laidley & Leatherland, 1988; Staurnes et al ., 1994; Molinero & González, 1995; Arends et al ., 1999; Barton, 2000; Marino et al ., 2001).…”

Annual variations of the plasmatic levels of glucose and amino acid and daily changes under different natural conditions of temperature and photoperiod in Gilthead Sea bream (Sparus aurata, L.)

“…In agreement with other authors (Gutiérrez et al 1984;Laidley and Leatherland 1988), our results show daily changes in glucose plasmatic levels. Fish Physiol Biochem (2011) 37:583-592 589 Usually, the glucose changes have been related with the feeding schedules and diet composition (Boujard et al 1993;Delahunty et al 1978;Gutiérrez et al 1984;Laidley and Leatherland 1988;Pavlidis et al 1997).…”

Effects of food deprivation on 24 h‐changes in brain and liver carbohydrate and ketone body metabolism of rainbow trout

“…The fall of lactate level at 2200 hours in plasma and liver did not occur in fasted fish, suggesting a dependency on feeding. Liver glycogen levels increased during the scotophase and decreased during the photophase in fed rainbow trout, in agreement with other studies on rainbow trout (Laidley & Leatherland, 1988), sea bass (Pérez et al, 1988) and tench (de Pedro et al, 1998) but in contrast to other studies on rainbow trout (Hilton et al, 1987; and Atlantic salmon (Soengas et al, 1996a). These increased glycogen levels may reflect that at least part of the increased plasma glucose levels post-feeding were directed to the liver to be stored as F.…”

“…Plasma glucose levels of rainbow trout were elevated after feeding, which is in agreement with most studies on teleosts including rainbow trout (Laidley & Leatherland, 1988;Boujard & Leatherland, 1992b;Boujard et al, 1993; T I. Effect of progressive fasting for up to 5 days on daily changes in the activities of potential regulatory enzymes of glycogenesis (glycogen synthetase, GSase) and glycolysis (6-phosphofructo 1-kinase, PFK; and lactate dehydrogenase, LDH) assayed in brain of rainbow trout.…”

Development of a microtitre plate indirect ELISA for measuring cortisol in teleosts, and evaluation of stress responses in rainbow trout and gilthead sea bream

“…As for precision of the system, (intra‐assay CV), this was comparable with those of other ELISA systems (<3, 6·9 and 5·5%, in Barry et al ., 1993; Nielsen et al ., 1994 and Carey & McCormick, 1998, respectively). Both reproducibility and precision were also similar to those obtained in RIA‐based systems (Laidley & Leatherland, 1988; Staurnes et al ., 1994; Molinero & González, 1995; Arends et al ., 1999; Barton, 2000; Marino et al ., 2001).…”

Annual variations of the plasmatic levels of glucose and amino acid and daily changes under different natural conditions of temperature and photoperiod in Gilthead Sea bream (Sparus aurata, L.)

“…In agreement with other authors (Gutiérrez et al 1984;Laidley and Leatherland 1988), our results show daily changes in glucose plasmatic levels. Fish Physiol Biochem (2011) 37:583-592 589 Usually, the glucose changes have been related with the feeding schedules and diet composition (Boujard et al 1993;Delahunty et al 1978;Gutiérrez et al 1984;Laidley and Leatherland 1988;Pavlidis et al 1997).…”

Effects of food deprivation on 24 h‐changes in brain and liver carbohydrate and ketone body metabolism of rainbow trout

“…The fall of lactate level at 2200 hours in plasma and liver did not occur in fasted fish, suggesting a dependency on feeding. Liver glycogen levels increased during the scotophase and decreased during the photophase in fed rainbow trout, in agreement with other studies on rainbow trout (Laidley & Leatherland, 1988), sea bass (Pérez et al, 1988) and tench (de Pedro et al, 1998) but in contrast to other studies on rainbow trout (Hilton et al, 1987; and Atlantic salmon (Soengas et al, 1996a). These increased glycogen levels may reflect that at least part of the increased plasma glucose levels post-feeding were directed to the liver to be stored as F.…”

“…Plasma glucose levels of rainbow trout were elevated after feeding, which is in agreement with most studies on teleosts including rainbow trout (Laidley & Leatherland, 1988;Boujard & Leatherland, 1992b;Boujard et al, 1993; T I. Effect of progressive fasting for up to 5 days on daily changes in the activities of potential regulatory enzymes of glycogenesis (glycogen synthetase, GSase) and glycolysis (6-phosphofructo 1-kinase, PFK; and lactate dehydrogenase, LDH) assayed in brain of rainbow trout.…”

Development of a microtitre plate indirect ELISA for measuring cortisol in teleosts, and evaluation of stress responses in rainbow trout and gilthead sea bream

“…As for precision of the system, (intra‐assay CV), this was comparable with those of other ELISA systems (<3, 6·9 and 5·5%, in Barry et al ., 1993; Nielsen et al ., 1994 and Carey & McCormick, 1998, respectively). Both reproducibility and precision were also similar to those obtained in RIA‐based systems (Laidley & Leatherland, 1988; Staurnes et al ., 1994; Molinero & González, 1995; Arends et al ., 1999; Barton, 2000; Marino et al ., 2001).…”

Annual variations of the plasmatic levels of glucose and amino acid and daily changes under different natural conditions of temperature and photoperiod in Gilthead Sea bream (Sparus aurata, L.)

“…In agreement with other authors (Gutiérrez et al 1984;Laidley and Leatherland 1988), our results show daily changes in glucose plasmatic levels. Fish Physiol Biochem (2011) 37:583-592 589 Usually, the glucose changes have been related with the feeding schedules and diet composition (Boujard et al 1993;Delahunty et al 1978;Gutiérrez et al 1984;Laidley and Leatherland 1988;Pavlidis et al 1997).…”