Journal
FISH PHYSIOLOGY AND BIOCHEMISTRY
Volume 37, Issue 3, Pages 495-504Publisher
SPRINGER
DOI: 10.1007/s10695-010-9451-2
Keywords
Amino acids; Cortisol; Feed deprivation; Plasma metabolites; Solea senegalensis
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Funding
- FCT, Portugal [POCTI/CVT/49324/2002]
- FEDER
- Ministerio de Educacion y Ciencia, Spain [AGL2007-61211/ACU]
- Consejeria de Innovacion, Ciencia y Empresa. Junta de Andalucia [PO7-RNM-02843]
- Fundacao para a Ciencia e Tecnologia, Portugal [SFRH/BD/38697/2007, SFRH/BPD/37197/2007]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/38697/2007, SFRH/BPD/37197/2007, POCTI/CVT/49324/2002] Funding Source: FCT
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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.
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