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Optimal management of the New Zealand longfin eel (Anguilla dieffenbachii)

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  • Graeme J. Doole

Abstract

Annual recruitment of the New Zealand longfin eel (Anguilla dieffenbachii) has decreased by 75 per cent since significant levels of commercial fishing began in the early 1970s. This motivates application of a multiple‐cohort bioeconomic model to a New Zealand longfin eel fishery to investigate its optimal management and ascertain the suitability of existing regulatory policy. The use of historical harvest to calculate total allowable catch is asserted to be unsustainable based on recovery dynamics. In addition, individual transferable quota systems are argued to be fundamentally flawed for the protection of longfin fisheries because of high‐grading, low‐surplus production and a current lack of effective stock‐assessment procedures. Area closure and the spatial definition of harvest rights are attractive alternatives given the territoriality of longfins and high larval spillover. The importance of unfished reserves is reinforced when significant uncertainties regarding population strength, harvest intensity and growth dynamics are considered. Restriction of exploitation to older cohorts in fished areas is demonstrated to maximise economic yield.

Suggested Citation

  • Graeme J. Doole, 2005. "Optimal management of the New Zealand longfin eel (Anguilla dieffenbachii)," Australian Journal of Agricultural and Resource Economics, Australian Agricultural and Resource Economics Society, vol. 49(4), pages 395-411, December.
    • Handle: RePEc:bla:ajarec:v:49:y:2005:i:4:p:395-411
    DOI: 10.1111/j.1467-8489.2005.00310.x
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    1. Batstone, C J & Sharp, B M H, 1999. "New Zealand's quota management system: the first ten years," Marine Policy, Elsevier, vol. 23(2), pages 177-190, March.
    2. Newell, Richard G. & Sanchirico, James N. & Kerr, Suzi, 2005. "Fishing quota markets," Journal of Environmental Economics and Management, Elsevier, vol. 49(3), pages 437-462, May.
    3. Jon M. Conrad, 1982. "Management of a Multiple Cohort Fishery: The Hard Clam in Great South Bay," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 64(3), pages 463-474.
    4. Grafton, R. Quentin & Kompas, Tom, 2005. "Uncertainty and the active adaptive management of marine reserves," Marine Policy, Elsevier, vol. 29(5), pages 471-479, September.
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    1. Holland, Luke M. & Doole, Graeme J., 2014. "Implications of fairness for the design of nitrate leaching policy for heterogeneous New Zealand dairy farms," Agricultural Water Management, Elsevier, vol. 132(C), pages 79-88.
    2. Liu, Yajie & Sumaila, Ussif Rashid & Volpe, John Paul, 2011. "Potential ecological and economic impacts of sea lice from farmed salmon on wild salmon fisheries," Ecological Economics, Elsevier, vol. 70(10), pages 1746-1755, August.
    3. Doole, Graeme J., 2012. "Cost-effective policies for improving water quality by reducing nitrate emissions from diverse dairy farms: An abatement–cost perspective," Agricultural Water Management, Elsevier, vol. 104(C), pages 10-20.

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