Modelling the use of two fishery access rights, concessions and licences, in the red sea urchin, Strongylocentrotus franciscanus (Agassiz), fishery at Santo Tomás, Baja California, Mexico
| Autor: | Evlin Ramírez-Félix, Héctor G Manzano-Monroy |
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| Jazyk: | English<br />Spanish; Castilian |
| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | Ciencias Marinas, Vol 30, Iss 4 (2004) |
| Druh dokumentu: | article |
| ISSN: | 0185-3880 2395-9053 |
| DOI: | 10.7773/cm.v30i4.343 |
| Popis: | Various stages of the red sea urchin, Strongylocentrotus franciscanus (Agassiz), fishery were simulated to evaluate the effect of two types of access rights under Mexican law: concessions and licences. The resource biomass was evaluated using the critical depensation and Schaefer models. Each model was evaluated as a static or dynamic system. The parameters required for each model were determined from government data and by generating stochastic numbers using the Monte Carlo method to adjust to a dynamic model. In general, both models predicted catches smaller than those observed. The five-year-period simulation for both models showed a drop in biomass when licences are issued, whereas a similar simulation for concessions resulted in increased biomass, except when high temperatures occurred. Our results suggest that issuing concessions rather than licences is the best option to conserve the fishery. |
| Databáze: | Directory of Open Access Journals |
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