Stock assessment of jumbo squid Dosidicus gigas in northwest Mexico
| Autor: | Francisco Javier Martínez-Cordero, Nicolás Castañeda-Lomas, Raúl Pérez-González, Ricardo Urías-Sotomayor, Gabriel Iván Rivera-Parra, Guillermo Rodríguez-Domínguez |
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| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
education.field_of_study Stock assessment 010604 marine biology & hydrobiology Maximum sustainable yield Fishing Population Model parameters Aquatic Science Oceanography 010603 evolutionary biology 01 natural sciences Fishery Gulf of California Catch-MSY Environmental science Carrying capacity Dosidicus gigas Schaefer's Model education stock assessment jumbo squid |
| Zdroj: | Latin american journal of aquatic research v.46 n.2 2018 SciELO Chile CONICYT Chile instacron:CONICYT Latin american journal of aquatic research, Volume: 46, Issue: 2, Pages: 330-336, Published: 2018 |
| ISSN: | 0718-560X |
| DOI: | 10.3856/vol46-issue2-fulltext-8 |
| Popis: | The population dynamics of jumbo squid Dosidicus gigas from northwest Mexico was evaluated for the period 1974-2012 using Schaefer's model, where model parameters were estimated with the catch maximum sustainable yield method (Catch-MSY) using two prior intrinsic population increase rate (r) range values (1.0 to 2.0 and 1.5 to 2.0). Estimated parameters with both prior r ranges were 1.23 and 1.68 yr−1 for r and 243,836 and 190,468 ton for carrying capacity (k), respectively. Corresponding management quantities were 75,147 and 80,098 ton for the maximum sustainable yield (MSY) and 121,918 and 95,234 ton for the biomass at MSY (BMSY). Estimated jumbo squid biomass dropped below the BMSY after 2003, and near to 0.2 k in 2012. The Schaefer's model showed that declines in estimated biomass were preceded by catches that exceeded the MSY. Strong El Niño-Southern Oscillation events can change the availability of jumbo squid in northwest Mexico through migratory processes and phenotype changes in maturation size, but stock biomass variability is most likely to be caused by fishing. |
| Databáze: | OpenAIRE |
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