Estimación de índices de abundancia de peces óseos a partir de datos de campañas de investigación en el área de "El Rincón", Argentina (39° S-41°S) : período 1994-2012.
Abundance indices of the main coastal bony fishes: whitemouth croaker (Micropogonias furnieri), stripped weakfish (Cynoscion guatucupa), Brazilian flathead (Percophis brasiliensis), Argentine seabass (Acanthistius patachonicus), sole (Paralichthys patagonicus and Xystreuris rasile), red porgy (Pagrus pagrus), Brazilian sandperch (Pseudopercis semifasciata) and butterfish (Stromateus brasiliensis) were estimated with data derived from Spring research cruises carried out by the Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) between 1994 and 2012 in the "El Rincón" area (39° S-41° S). The estimate methodologies used included arithmetic mean, Delta mean and the Delta Approach that consists of applying two generalized linear models (GLMs), one to the positive values with Lognormal distribution (Lognormal Model) and another to the proportion of positive registries with Binomial distribution (Binomial Model). The possible effect of the management measures established in the area in 2004 on abundance of said resources was given particular attention. The Lognormal models explained between 20 and 48 percent of total variability; the stripped weakfish model represented the lowest (20 percent); the highest was obtained in that of Brazilian flathead (46 percent). In the case of whitemouth croaker, red porgy and Brazilian sandperch, the annual factor was not significant, which makes GLM application senseless. The different methods employed to estimate abundance level, that indicated a decreasing trend, show the history of the fishery in the area in the 1990's when, as a consequence of an increase in landings, a reduction in biomass of all species was registered. The result of the restrictive measures to fishing implemented in 2009 was reflected in the recovery of that of Brazilian sandperch, Argentine seabass, red porgy and sole, although not reaching the levels observed at the beginning of the study period. This work is the first descriptive analysis of coastal bony fishes abundance in the area. Future studies could contemplate a more detailed analysis of each species and its relation to the environment or the application of other estimate methodologies such as geostatistics.
| Main Authors: | , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Spanish / Castilian |
| Published: |
2017
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| Subjects: | Captura/esfuerzo, Abundancia, Poder de pesca, Modelos matemáticos, Zonas de pesca, Evaluación de efectivos, Pesquería costera, Sciaenidae, Micropogonias furnieri, Cynoscion guatucupa, Percophididae, Percophis brasiliensis, Serranidae, Acanthistius brasilianus, Acanthistius patachonicus, Paralichthyidae, Paralichthys patagonicus, Xystreurys rasile, Pinguipedidae, Pseudopercis semifasciata, Stromateidae, Stromateus brasiliensis, Corvina, Pescadilla de red, Pez palo, Mero, Lenguado, Salmón de mar, Pampanito, ASFA_2015::C::Catch/effort, ASFA_2015::A::Abundance, ASFA_2015::F::Fishing power, ASFA_2015::M::Mathematical models, ASFA_2015::F::Fishing grounds, ASFA_2015::S::Stock assessment, ASFA_2015::C::Coastal fisheries, |
| Online Access: | http://hdl.handle.net/1834/10990 |
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| Summary: | Abundance indices of the main coastal bony fishes: whitemouth croaker (Micropogonias furnieri), stripped weakfish (Cynoscion guatucupa), Brazilian flathead (Percophis brasiliensis), Argentine seabass (Acanthistius patachonicus), sole (Paralichthys patagonicus and Xystreuris rasile), red porgy (Pagrus pagrus), Brazilian sandperch (Pseudopercis semifasciata) and butterfish (Stromateus brasiliensis) were estimated with data derived from Spring research cruises carried out by the Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) between 1994 and 2012 in the "El Rincón" area (39° S-41° S). The estimate methodologies used included arithmetic mean, Delta mean and the Delta Approach that consists of applying two generalized linear models (GLMs), one to the positive values with Lognormal distribution (Lognormal Model) and another to the proportion of positive registries with Binomial distribution (Binomial Model). The possible effect of the management measures established in the area in 2004 on abundance of said resources was given particular attention. The Lognormal models explained between 20 and 48 percent of total variability; the stripped weakfish model represented the lowest (20 percent); the highest was obtained in that of Brazilian flathead (46 percent). In the case of whitemouth croaker, red porgy and Brazilian sandperch, the annual factor was not significant, which makes GLM application senseless. The different methods employed to estimate abundance level, that indicated a decreasing trend, show the history of the fishery in the area in the 1990's when, as a consequence of an increase in landings, a reduction in biomass of all species was registered. The result of the restrictive measures to fishing implemented in 2009 was reflected in the recovery of that of Brazilian sandperch, Argentine seabass, red porgy and sole, although not reaching the levels observed at the beginning of the study period. This work is the first descriptive analysis of coastal bony fishes abundance in the area. Future studies could contemplate a more detailed analysis of each species and its relation to the environment or the application of other estimate methodologies such as geostatistics. |
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