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Comparing Economic Dynamics of Oyster and Mussel Farming, with Particular Emphasis on their Profitability: An Application in the Mont-Saint-Michel Bay (France)

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  • This paper sets out an evaluation of profitability differentials within shellfish farming activities of the Mont-Saint-Michel Bay. The objective is to examine whether profitability differentials have consequences in terms of economic dynamics and of management arrangements. The paper divides into four parts. The first part presents a retrospective analysis of shellfish farming activities in the Bay, which are nowadays dominated by Pacific oyster (Crassostrea gigas) and Blue mussel (Mytilus edulis). The second part consists in measuring the economic performances of enterprises. The indicators are based on the data provided by two surveys conducted in 2002 (mussel-farming) and 2004 (oyster-farming); methodological difficulties due in particular to the status of shellfish farming land are addressed here. The third part examines the determinants of the profitability for each sector, the profitability being the result of a combination of factors such as natural productivity, technical practices, production costs and products pricing. The last part discusses the implications of profitability differentials. Profitability differentials seem to be correctly reflected in land prices, but not necessarily in the annual ground fees perceived by the Administration. However, shellfish farming profitability should be included in redistributive mechanisms, as its relation to primary resources exploitation and management is not neutral. Thus, empirical evidence suggests that profitability differentials create bargaining powers which influence the results of negotiation between actors regarding the management of the Mont-Saint-Michel Bay.
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  • Mongruel, Rémi and José A. Perez Agundez. 2006. Comparing Economic Dynamics of Oyster and Mussel Farming, with Particular Emphasis on their Profitability: An Application in the Mont-Saint-Michel Bay (France). In: Proceedings of the Thirteenth Biennial Conference of the International Institute of Fisheries Economics & Trade, July 11-14, 2006, Portsmouth, UK: Rebuilding Fisheries in an Uncertain Environment. Compiled by Ann L. Shriver. International Institute of Fisheries Economics & Trade, Corvallis, Oregon, USA, 2006. CD ROM. ISBN 0-9763432-3-1
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  • The National Oceanic & Atmospheric Administration Marine Fisheries Service, United States Department of Commerce (NOAA Fisheries); United Kingdom Department for Environment, Food and Rural Affairs (DEFRA); The United States Agency for International Development supported Aquaculture Collaborative Research and Support Program (ACRSP).
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