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Environmental Biology of Fishes

, Volume 92, Issue 3, pp 413–423 | Cite as

Length and weight estimates from diagnostic hard part structures of fish, crustacea and cephalopods forage species in the western Indian Ocean

  • Michel Potier
  • Frédéric Ménard
  • Herman Doris Benivary
  • Richard Sabatié
Article

Abstract

To estimate the original prey size of well-digested prey (fish, cephalopod and crustacean) of large pelagic fish predators representing 17 species in eight families (Scombridae, Xiphiidae, Istiophoridae, Carangidae, Coryphaenidae, Alepisauridae, Sphyraenidae and Carcharhinidae), we presented regression equations relating the length and weight of the prey to lengths of diagnostic hard part structures recovered from stomach contents. Stomach samples were collected in the western Indian Ocean between 2000 and 2008 from predators caught by three fishing gears: longline, purse seine and troll lines. In addition, fresh specimens were collected from trawls nets carried out during scientific cruises at depths ranging from the surface to 500 m. Parameters of the least-square regression equations were estimated between different diagnostic hard parts and the length and the weight of the prey. These relationships are useful for estimating the reconstructed weight of the diet of top predators and for estimating the predator size-prey size ratios. This work is the first reference on such relationships for the forage fauna of the western Indian Ocean.

Keywords

Hard part structures Prey Weight-length relationships Length-length relationships Diet Reconstructed weight 

Notes

Acknowledgements

We wish to thank the Seychelles Fishing Authority (SFA), owner of the longliner “Amitié”, the Paul Emile Victor Institute (IPEV) owner of the R/V La Curieuse, the ASCLME project which allowed us to embark on board the R/V F. Nansen, and the crew of all the vessels and purse seiners for helping us to undertake this research program by hosting us for the trips on board. This work was supported by the BIOPS project funded by la Fondation pour la Recherche sur la Biodiversité (No. CD-AOOI-07-013). We thank anonymous referees for their valuable comments and suggestions that helped us to improve the manuscript.

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Michel Potier
    • 1
  • Frédéric Ménard
    • 1
  • Herman Doris Benivary
    • 2
  • Richard Sabatié
    • 3
  1. 1.IRD, UMR 212 EME (IRD/Ifremer/UM2), Centre de Recherche Halieutique Méditerranéenne et TropicaleSète CedexFrance
  2. 2.Institut Universitaire de Science de l’Environnement et de Santé, Université d’AntsirananaMadagascarFrance
  3. 3.Agrocampus Ouest, Pôle HalieutiqueRennes CedexFrance

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