Journal Article
Title | Feed deprivation in Senegalese sole (Solea senegalensis Kaup, 1858) juveniles: effects on blood plasma metabolites and free amino acid levels. |
Publication Type | Journal Article |
Authors | Costas, B, Aragão, C, Ruiz-Jarabo, I, Vargas-Chacoff, L, Arjona, FJesús, Dinis, MTeresa, Mancera, JMiguel, Conceição, LEC |
Year of Publication | 2011 |
Journal | Fish Physiol Biochem |
Volume | 37 |
Issue | 3 |
Date Published | 2011 Sep |
Pagination | 495-504 |
ISSN | 1573-5168 |
Keywords | Amino Acids, Animals, Blood Glucose, Flatfishes, Food Deprivation, Hydrocortisone, Lactates, Time Factors, Triglycerides |
Abstract | 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. However, plasma cortisol levels were higher in feed-deprived fish, while plasma glucose and lactate values were not significantly different between treatments. Furthermore, feed-deprived fish showed higher levels of total plasma free amino acids than 24 h fasted fish. In 21 days feed-deprived sole, an increase in plasma cortisol levels may suggest a functional role in mobilizing energy due to the catabolic action of this hormone in teleosts. Higher levels of glutamine, arginine and ornithine in 21 days feed-deprived fish may be indicative of a dual role for these amino acids: ammonia detoxification and carbon source for gluconeogenesis. The increased plasma glucogenic and branched-chain amino acid levels, together with the maintenance of plasma glucose in 21 days feed-deprived sole, suggest active liver gluconeogenic processes supported by tissue proteolysis. |
DOI | 10.1007/s10695-010-9451-2 |
Sapientia | |
Alternate Journal | Fish Physiol. Biochem. |
PubMed ID | 21107905 |