RT Journal Article
T1 Physio-metabolic response of rainbow trout during prolonged food deprivation before slaughter
A1 Bermejo Poza, Rubén
A1 Fernández-Muela Garrote, Montserrat
A1 Fuente Vázquez, Jesús De La
A1 Pérez Marcos, Concepción
A1 González De Chávarri Echániz, Elisabeth
A1 Díaz Díaz Chirón, María Teresa
A1 Torrent, Fernando
A1 Villarroel, Morris
AB Fish normally undergo periods of food deprivation that are longer than non-hibernating mammals. In aquacultured rainbow trout (Oncorhynchus mykiss), it is unclear how fasting may affect their physiological adaptative response, especially when they are normally fed daily. In addition, that response may vary with temperature, making it necessary to express fasting duration in terms of degree days. In the current study, trout were fasted for 5, 10, and 20 days (55, 107, and 200 degree days (°C d), respectively). To assess the physiological response of fish to fasting, different biometric, blood, plasma, and metabolic parameters were measured, as well as liver fatty acid composition. The fish weight, condition factor, and the hepato-somatic index of 5-day fasted trout were not significantly different from those of control fish. Gastric pH increased as fasting progressed while plasma concentrations of glucose, triglycerides, and total proteins decreased significantly after 10 days of fasting, while the percentage of non-esterified fatty acids increased. There were no significant differences in plasma ions (sodium, potassium, and calcium), except for chloride ion which decreased after 5 days of fasting. Liver glycogen decreased after 5 days of fasting while glycogen concentration in muscle did not decrease until 20 days of fasting. Liver color presented a higher chroma after 5 days of fasting, suggesting a mobilization of reserves. Finally, acetylcholinesterase activity in the brain was not affected by food deprivation but increased after 10 days of fasting in liver and muscle, suggesting the mobilization of body reserves, but without severely affecting basal metabolism.
PB Springer
SN 0920-1742
YR 2018
FD 2018
LK https://hdl.handle.net/20.500.14352/116451
UL https://hdl.handle.net/20.500.14352/116451
LA eng
NO Bermejo-Poza, R., Fernández-Muela, M., De la Fuente, J. et al. Physio-metabolic response of rainbow trout during prolonged food deprivation before slaughter. Fish Physiol Biochem 45, 253–265 (2019). https://doi.org/10.1007/s10695-018-0559-0
NO Ministerio de Economía y Competitividad (España)
DS Docta Complutense
RD 1 ene 2026