A Management Policy for the Scoop Nets Fishery of Ayu Population in Lake Biwa

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  • Suzuki Naoki
    Department of Fisheries Resource Management, Tokyo University of Fisheries
  • Kitahara Takeru
    Department of Fisheries Resource Management, Tokyo University of Fisheries

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  • Management Policy for the Scoop Nets Fi

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The purpose of this paper is to determine the optimal landing in weight of ayu Plecoglossus altivelis in the scoop nets fishery. First, we define a price function of the landing in weight, taking into consideration its variation within a fishing season. Next, we determine a cost function in a short term, which is the variable cost, through interviews with many fishermen at Lake Biwa. Here, the cost does not mean the opportunity cost. Then, we derive an optimal control problem to determine the landing in weight that maximizes the profit (the landing in value terms minus the cost) subject to some constraints, using the discrete maximum principle. A comparison between the optimized and the real fishery shows that the real fishery is more costly than the optimized one and hence, in spite of larger landings in weight, the total profit of the real fishery is less than the optimized one. This means that the scoop nets fishery is competitively operated.

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