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Aquaculture International

, Volume 10, Issue 2, pp 157–175 | Cite as

Production of Australian freshwater crayfish in earthen-based systems using pelleted diets and forage crops as food

  • Paul L. Jones
  • Jose R. Chavez
  • Brad D. Mitchell
Article

Abstract

Juvenile Cherax destructor (commonly called theyabby) were cultured in earthen-based ponds and tanks for 70–105d, and were fed pellets and/or a forage crop of the perennialwhiteclover, Trifolium repens. Three supplementary feedingstrategies were evaluated. Yabby growth on pellets consistently exceeded (by67–159%) that obtained on clover. Base-line yields for extensiveproduction systems are around 400 kg ha−1. Thesupplementary addition of T. repens produced yields of 635kg ha−1 (in ponds) to 1086 kgha−1 (in tanks). The sequential addition of cut-cloverto tanks stimulated growth to levels approaching those achieved on pellets.Yabbies stocked into ponds at 17 m−2 and fed 33%protein pellets for 100 d, resulted in a yield of 1117 kgha−1.Pellet inputs at a rate of 129–249 g m−2(dry matter) and 38–83 g m−2 (protein) over70–100 d resulted in acceptable growth and feed utilisationindices. Clover inputs of 534–682 g m−2 (asdry matter) or 84–177 g m−2 (as protein)produced reasonable growth rates but poor feed utilisation indices. Aconsiderable quantity of the dry matter and protein content of clover waseitherinefficiently utilised or directed into other production pathways. In tanks,clover inputs from 113–296 g m−2 (drymatter) and 24–54 g m−2 (protein) weresufficient to maintain high growth rates for 4 weeks, while in ponds, inputs of21 g m−2 (dry matter) and 4.3 gm−2 (protein) were sufficient for 3 weeks. During theearly weeks of production no growth advantage was gained by providing pelletstoanimals cultured in forage-based systems. Forage depletion occurred after3–4 weeks and was probably a major growth limiting factor.

Cherax destructor (yabby) Earthen-based production Feeding Growth 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Paul L. Jones
    • 1
  • Jose R. Chavez
    • 1
  • Brad D. Mitchell
    • 1
  1. 1.School of Ecology and EnvironmentDeakin UniversityWarrnamboolAustralia

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