The Achilles heel for spiny lobsters: the energetics of the non-feeding post-larval stage

Authors

  • Quinn P Fitzgibbon,

    Corresponding author
    1. Fisheries, Aquaculture and Coasts, Institute for Marine and Antarctic Studies (IMAS), University of Tasmania, Hobart TAS 7001, Australia
    • Correspondence:

      Quinn P Fitzgibbon, Fisheries, Aquaculture and Coasts, Institute for Marine and Antarctic Studies (IMAS), University of Tasmania, Private Bag 49, Hobart TAS 7001, Australia

      Tel.: +61 3 62277242

      Fax: +61 3 62278035

      E-mail: Quinn.Fitzgibbon@utas.edu.au

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  • Andrew G Jeffs,

    1. Leigh Marine Laboratory, University of Auckland, Warkworth 0941, New Zealand
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  • Stephen C Battaglene

    1. Fisheries, Aquaculture and Coasts, Institute for Marine and Antarctic Studies (IMAS), University of Tasmania, Hobart TAS 7001, Australia
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Abstract

Spiny lobsters are highly valuable seafood species that are captured and marketed in more than 90 countries. After more than 30 years of stable catches, spiny lobster fisheries in many parts of the world are declining due to decreased recruitment. The planktonic larvae spend up to 2 years in offshore waters, accumulating energy stores to fuel the non-feeding post-larva, or puerulus, to actively migrate onshore and settle. The total energy required by spiny lobster pueruli for cross-shelf migration has not been accurately determined. Recent advances in larval culture have provided the opportunity for the first detailed examination of the swimming performance, respiratory metabolism and nitrogen excretion of spiny lobster (Sagmariasus verreauxi) throughout the puerulus stage. The routine and active metabolic rates of pueruli were lower than for most other decapod larvae, probably to provide greater energy efficiency. However, pueruli were found to have limited time, swimming ability and fuel for active cross-shelf migration. It is estimated that S. verreauxi pueruli require at least 13.8 mg of stored lipid to provide sufficient energy (18.4% DW) to complete the puerulus stage and recruit to coastal habitats. The ability of the preceding phyllosoma larvae to accumulate these reserves, and the presence of favourable oceanographic conditions during the limited time available to the migrating puerulus, are both crucial to subsequent successful recruitment. Spiny lobster recruitment processes appear to be particularly vulnerable to changes in oceanic climate which is likely to contribute to the recent large-scale declines in recruitment to valuable fished populations.

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