Document Detail

The influence of size, sex and season on the feeding regime of Synodontis membranaceus (Osteichthyes: Mochokidae) in Jebba Lake, Nigeria.
MedLine Citation:
PMID:  19093475     Owner:  NLM     Status:  MEDLINE    
The influence of size, sex and season on the feeding regime of S. membranaceus were examined over a period of 24 months in Jebba Lake, Nigeria using frequency of occurrence, numerical, gravimetric and index of Relative Importance (RI) methods. Dietary composition and feeding intensity were sex dependent. RI established that there was a progression from a detritivorous diet in fish below 20 cm Standard Length (SL), through a transitional planktivorous phase (20-27 cm, SL), to a predominantly molluscivorous/insectivorous diet in fish above 27 cm SL; thus indicating a switch from a relatively passive filter-feeding habit when young to an active predatory habit at adult stage. Food preference also varied with season hence intraspecific competitions were low. Abundant food and ability to evolve trophic strategies that ensure optimum foraging in spite of seasonal changes enable S. membranaceus to maintain its overwhelming prominence and wide distribution in Jebba Lake.
Olufemi D Owolabi
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Pakistan journal of biological sciences: PJBS     Volume:  10     ISSN:  1028-8880     ISO Abbreviation:  Pak. J. Biol. Sci.     Publication Date:  2007 Oct 
Date Detail:
Created Date:  2008-12-19     Completed Date:  2009-01-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101247723     Medline TA:  Pak J Biol Sci     Country:  Pakistan    
Other Details:
Languages:  eng     Pagination:  3644-9     Citation Subset:  IM    
Department of Zoology, University of Ilorin, P.M.B. 1515, Ilorin 240003, Nigeria.
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MeSH Terms
Catfishes / physiology*
Feeding Behavior / physiology*
Food Preferences*
Fresh Water*
Gastrointestinal Contents
Sex Characteristics*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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