| Daily rhythms of locomotor activity, feeding behavior and dietary selection in Nile tilapia (Oreochromis niloticus). | |
| | |
MedLine Citation:
|
PMID: 20382252 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Fish do not feed at any time of the day and on whatever food item they encounter in the wild, but they show daily rhythms of feeding activity and dietary selection. The aim of this research was to investigate the daily rhythms of behavior in Nile tilapia self-fed with plant-based diets supplemented with different levels of exogenous phytase (an enzyme that hydrolyzes non-digestible phytate and improves the nutritional value of the diet). To this end, ten males were individually kept in 50-L tanks, each equipped with two self-feeders and one infrared photo-cell connected to a computer. The selection factors investigated were the level of phytase supplementation (0 IU kg(-1) vs 1500 IU kg(-1); 1500 IU kg(-1) vs 4000 IU kg(-1)) or sodium phytate (1% phytate vs 1% phytate+1500 IU kg(-1) phytase). The results revealed that 66.7% of total daily activity occurred during the day, while feeding was strictly nocturnal, with 93.0% of the daily food demands occurring at night. Tilapia preferred the diet with 1500 IU kg(-1) phytase rather than the control or 4000 IU kg(-1) diets. When exogenous sodium phytate was added to the diet, tilapia preferred the phytase diet. In conclusion tilapia self-feed at night (although locomotor activity was mostly diurnal) and chose plant-diets containing phytase, which should be taken into account when designing feeding strategies and practical diets for tilapia aquaculture. |
| | |
Authors:
|
R Fortes-Silva; F J Martínez; M Villarroel; F J Sánchez-Vázquez |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-04-09 |
Journal Detail:
|
Title: Comparative biochemistry and physiology. Part A, Molecular & integrative physiology Volume: 156 ISSN: 1531-4332 ISO Abbreviation: Comp. Biochem. Physiol., Part A Mol. Integr. Physiol. Publication Date: 2010 Aug |
Date Detail:
|
Created Date: 2010-06-23 Completed Date: 2011-01-25 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 9806096 Medline TA: Comp Biochem Physiol A Mol Integr Physiol Country: United States |
Other Details:
|
Languages: eng Pagination: 445-50 Citation Subset: IM |
Copyright Information:
|
Copyright (c) 2010 Elsevier Inc. All rights reserved. |
Affiliation:
|
Department of Physiology, Faculty of Biology, University of Murcia, 30100 Murcia, Spain. fortesrs@yahoo.com.br |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
6-Phytase
/
metabolism Animals Cichlids / metabolism, physiology* Circadian Rhythm / physiology* Diet / veterinary* Feeding Behavior / physiology* Male Motor Activity / physiology* |
| Chemical | |
Reg. No./Substance:
|
EC 3.1.3.26/6-Phytase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Cave colonization without fasting capacities: an example with the fish Astyanax fasciatus mexicanus.
Next Document: Identification and analysis of a Scophthalmus maximus ferritin that is regulated at transcription le...