Document Detail

Diet composition and diel feeding behaviour of the banded guitarfish Zapteryx xyster along the Pacific coast of Costa Rica, Central America.
MedLine Citation:
PMID:  23331151     Owner:  NLM     Status:  In-Data-Review    
The diet and diel feeding behaviour of the banded guitarfish Zapteryx xyster were examined along the Pacific coast of Costa Rica. A sample of 235 stomachs was collected between March 2010 and December 2011 as part of an ongoing shrimp-trawl by-catch monitoring programme. Samples from multiple day and night periods allowed testing the hypothesis that Z. xyster is more active at night, thus increasing the amount of food intake during night-time. Overall, shrimps (52·3% prey-specific index of relative importance, P(SIRIi) ) and teleosts (27·2% P(SIRIi) ) were the most important prey categories. Juveniles fed primarily on smaller shrimps (Solenocera spp.), while adults shifted to larger prey. The amount of food consumed (as % of bodymass) by juvenile and adult Z. xyster increased significantly between 0400 and 1200 hours, while the proportion of empty stomachs decreased during the same time interval. These findings contradict the hypothesis that Z. xyster is more active and feeds at night. The study also revealed that Z. xyster, particularly juveniles, forage on several shrimp species and overlap spatially with the Costa Rican bottom-trawl fisheries. This has important management and conservation implications as Z. xyster may be experiencing high by-catch rates, and because of their life history is presumed to be vulnerable to intense levels of exploitation.
M Espinoza; T M Clarke; F Villalobos-Rojas; I S Wehrtmann
Publication Detail:
Type:  Journal Article     Date:  2012-11-30
Journal Detail:
Title:  Journal of fish biology     Volume:  82     ISSN:  1095-8649     ISO Abbreviation:  J. Fish Biol.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-01-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0214055     Medline TA:  J Fish Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  286-305     Citation Subset:  IM    
Copyright Information:
© 2012 The Authors. Journal of Fish Biology © 2012 The Fisheries Society of the British Isles.
Unidad de Investigación Pesquera y Acuicultura (UNIP) of the Centro de Investigación en Ciencias del Mar y Limnología (CIMAR), 11501-2060 San José, Costa Rica.
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