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Jointness through fishing days input in a multi-species Fishery

Author

Listed:
  • Lars Gårn Hansen

    (Institute of Food and Resource Economics, University of Copenhagen)

  • Carsten Lynge Jensen

    (Institute of Food and Resource Economics, University of Copenhagen)

Abstract

Some multi-species fisheries are characterised by production jointness in the sense that several species are caught through a joint production process (literally in the same haul of the net). Other multi-species fisheries (so called purse seine fisheries) are specialized in the sense that species are targeted individually and by-catch is negligible, but over the fishing season the same boat chooses to target several species with varying intensity which also results in a sort of jointness. Both types of fisheries are typically modelled using standard multi-input multi-output profit function forms (e.g. translog, normalized quadratic). In this paper we argue that jointness in the latter, essentially separable fishery is caused by allocation of fishing days input among harvested species. We developed a structural model of a multi-species fishery where the allocation of fishing days input causes production jointness. We estimate the model for the Norwegian purse seine fishery and find that it is characterised by non-jointness, while estimations for this fishery using the standard multi-input multi-output profit function imply jointness.

Suggested Citation

  • Lars Gårn Hansen & Carsten Lynge Jensen, 2010. "Jointness through fishing days input in a multi-species Fishery," IFRO Working Paper 2010/8, University of Copenhagen, Department of Food and Resource Economics.
    • Handle: RePEc:foi:wpaper:2010_08
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    References listed on IDEAS

    as
    1. Quinn Weninger, 1998. "Assessing Efficiency Gains from Individual Transferable Quotas: An Application to the Mid-Atlantic Surf Clam and Ocean Quahog Fishery," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 80(4), pages 750-764.
    2. Dale Squires, 1988. "Production Technology, Costs, and Multiproduct Industry Structure: An Application of the Long-run Profit Function to the New England Fishing Industry," Canadian Journal of Economics, Canadian Economics Association, vol. 21(2), pages 359-378, May.
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    More about this item

    Keywords

    production jointness; multi-species fisheries; structural modeling;
    All these keywords.

    JEL classification:

    • Q22 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Renewable Resources and Conservation - - - Fishery
    • C51 - Mathematical and Quantitative Methods - - Econometric Modeling - - - Model Construction and Estimation

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