Nova Publishers
My Account Nova Publishers Shopping Cart
HomeBooksSeriesJournalsReference CollectionseBooksInformationSalesImprintsFor Authors
  Top » Catalog » Books » Biology » Physiology » Biology of Starvation in Humans and Other Organisms Chapters » My Account  |  Cart Contents  |  Checkout   
Quick Find
Use keywords to find the product you are looking for.
Advanced Search
What's New? more
Brain, Body, Cognition - A continuation of Functional Neurology, Rehabilitation and Ergonomics
Shopping Cart more
0 items
Shipping & Returns
Privacy Notice
Conditions of Use
Contact Us
Notifications more
NotificationsNotify me of updates to Metabolic Responses to Food Deprivation in Fish pp. 303-346
Tell A Friend
Tell someone you know about this product.
Metabolic Responses to Food Deprivation in Fish pp. 303-346 $100.00
Authors:  (Amalia Pérez-Jiménez, Cristina E. Trenzado Romero, Gabriel Cardenete Hernández, Dpt. Animal Biology, Faculty of Sciencies, University of Granada, Campus Fuentenueva, 18071, Granada, Spain)
Fish, in general, manifest a high capacity to face short or long starvation periods in natural environment conditions: fluctuations in press availability, reproductive processes, migrations, etc. By other hand, farmed fish also undergo fasting periods derived from practices associated to aquaculture conditions. Food deprivation, whether under natural or artificial conditions, entails a mobilization of energy stores, and in some cases of body tissues, by physiological and metabolic adjustment to cover survival energy requirements. In this sense, decreased weight values and changes in tissues composition are common responses in fish under this adverse condition. The mobilization of reserves is mediated by the endocrine system through complex process involving several hormonal factors. Nevertheless, there are intra and interspecific factors that affect the metabolic response to starvation. In most fish species, food deprivation leads to hypoglycemia. Moreover, in the first stages of starvation an activation of hepatic glycogenolytic pathway is manifested in order to maintain plasma glucose levels and cover energy expenditure. Glycogen in muscle can be decreased or otherwise maintained at expense of hepatic glucose release. Hypoglucemic status can induce a lower glucose cellular caption by a decreases activity of enzymes related to this substrate catabolism. Under this condition an activation of gluconeogenic pathways occurs in response to decreased glucose levels. In parallel with glycogen exhaustion, activation of lipid reserves catabolism plays an important role covering energy demands. The evaluation of different lipid body reserves in fish under a starvation condition manifested a first mobilization of perivisceral fat followed consecutively by hepatic and muscle stores. It is remarkable that this response can be different according to fish species. Finally, if starvation is prolonged in time, proteins from muscle would be mobilized as gluconeogenic substrate and also with energy purposes, being manifested an increased activity of enzymes that supplies amino acids. Depending of starvation conditions, fish refeeding would lead to a total, partial or ineffective recovery response if irreversible fish deterioration is produced. However, fish damages are not usually dramatic, so they can restore physiological parameters previous to starvation. In this sense, a fast weight recovery is usually linked to an increased grow rate that indeed exceeds original values previous to food deprivation. This response is called "compensatory growth" and it is of great interest for fish production practices since an adequate management by alternating fasting and refeeding cycles would increase production of a determined fish species derived from an improved growth rate and conversion index. 

Available Options:
Special Focus Titles
01.Violent Communication and Bullying in Early Childhood Education
02.Cultural Considerations in Intervention with Women and Children Exposed to Intimate Partner Violence
03.Chronic Disease and Disability: The Pediatric Lung
04.Fruit and Vegetable Consumption and Health: New Research
05.Fire and the Sword: Understanding the Impact and Challenge of Organized Islamism. Volume 2

Nova Science Publishers
© Copyright 2004 - 2021

Metabolic Responses to Food Deprivation in Fish pp. 303-346