This study focuses on the determination of an optimal fishing effort for the marine artisanal fishery in Ghana. That is, the rate of harvest maximizing the net economic benefits while also maximizing the stock size. Employing the Gordon-Schaefer bioeconomic model and using empirical data on the round sardinella (Sardinella aurita), the static reference points of the model comprising the maximum sustainable yield (MSY), maximum economic yield (MEY) and open access yield (OAY) are determined and discussed. Further, the dynamic reference point of the model, the optimum sustainable yield (OSY), is also explored. Bifurcation analysis of the model shows that it undergoes transcritical bifurcation, and it is structurally stable for rate of effort not exceeding the bifurcation point. The characterization of the optimal control indicates that the resource should only be harvested by exerting up to the maximum available effort if the net revenue per unit harvest exceeds (or equals) the shadow price. Numerical simulations carried out on the dynamic model indicate that the optimal fishing effort should be set at 351; 328 trips per year, provided the initial stock size is at least 554; 654 tonnes. However, given the current high rate of fishing effort, due to the open access nature of the fishery, the recommended optimal effort strategy is bang-bang, which translates into implementation of closed fishing seasons.
机构:
Ctr Fisheries Res, Komplek Bina Samudera, Jakarta 14430, IndonesiaCtr Fisheries Res, Komplek Bina Samudera, Jakarta 14430, Indonesia
Natsir, Mohamad
Ruchimat, Toni
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Ctr Fisheries Res, Komplek Bina Samudera, Jakarta 14430, IndonesiaCtr Fisheries Res, Komplek Bina Samudera, Jakarta 14430, Indonesia
Ruchimat, Toni
Agustina, Siska
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WCS, Jalan Tampomas 35, Bogor, IndonesiaCtr Fisheries Res, Komplek Bina Samudera, Jakarta 14430, Indonesia
Agustina, Siska
Yulianto, Irfan
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WCS, Jalan Tampomas 35, Bogor, Indonesia
Bogor Agr Univ, Fac Fisheries & Marine Sci, Kampus IPB Darmaga, Bogor, IndonesiaCtr Fisheries Res, Komplek Bina Samudera, Jakarta 14430, Indonesia
机构:
Univ West Indies, Dept Biol & Chem Sci, Cave Hill Campus, BB-11000 St Michael, BarbadosUniv West Indies, Dept Biol & Chem Sci, Cave Hill Campus, BB-11000 St Michael, Barbados
Blades, D. Connor
Walcott, J.
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Univ West Indies, Ctr Resource Management & Environm Studies, Cave Hill Campus, BB-11000 St Michael, BarbadosUniv West Indies, Dept Biol & Chem Sci, Cave Hill Campus, BB-11000 St Michael, Barbados
Walcott, J.
Horrocks, J. A.
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Univ West Indies, Dept Biol & Chem Sci, Cave Hill Campus, BB-11000 St Michael, BarbadosUniv West Indies, Dept Biol & Chem Sci, Cave Hill Campus, BB-11000 St Michael, Barbados
机构:
Univ Autonoma Nuevo Leon, Fac Ciencias Biol, Dept Vertebrados, Lab Ictiol, Ciudad Univ, San Nicolas De Los Garza 66450, Nuevo Leon, MexicoCtr Invest Tiburones CIT, Ave Don Bosco,Qta ABC,10, Caracas 1050, Venezuela
Carreon-Zapiain, Maria T.
Perez-Jimenez, Juan Carlos
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El Colegio Frontera Sur, Ave Rancho Poligono 2-A,Ciudad Ind Lerma, Campeche 24500, MexicoCtr Invest Tiburones CIT, Ave Don Bosco,Qta ABC,10, Caracas 1050, Venezuela
机构:
Univ Magdalena, Fac Ingn, Carrera 32 22-08, Santa Marta, ColombiaUniv Magdalena, Fac Ingn, Carrera 32 22-08, Santa Marta, Colombia
Altamar, Jairo
Correa-Helbrum, Jesus
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Univ Magdalena, Fac Ingn, Carrera 32 22-08, Santa Marta, Colombia
Pontificia Univ Catolica Valparaiso, Fac Ciencias del Mar & Geog, Escuela Ciencias del Mar, Valparaiso, ChileUniv Magdalena, Fac Ingn, Carrera 32 22-08, Santa Marta, Colombia
Correa-Helbrum, Jesus
Restrepo-Leal, Diego
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Univ Magdalena, Fac Ingn, Carrera 32 22-08, Santa Marta, ColombiaUniv Magdalena, Fac Ingn, Carrera 32 22-08, Santa Marta, Colombia
Restrepo-Leal, Diego
Robles-Algarin, Carlos
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Univ Magdalena, Fac Ingn, Carrera 32 22-08, Santa Marta, ColombiaUniv Magdalena, Fac Ingn, Carrera 32 22-08, Santa Marta, Colombia