Un modelo simple para describir la dinámica de la biomasa del camarón nailon Heterocarpus reedi en Coquimbo, Chile

Pérez, Eduardo Prados

doi:10.4067/s0717-71782005000200001

Cited by 5 publications

(6 citation statements)

References 13 publications

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“…The lower biomass of both resources (SUBPESCA, 2003(SUBPESCA, , 2005a(SUBPESCA, , 2005bPérez, 2003Pérez, , 2005Quiroz et al, 2005) was consistent with the increase in average production costs due to the decline in the CPUE (Pérez, 2003(Pérez, , 2005, the need to increase the number of fishing trips, and costs associated with these trips. For example, the catch increased 21% between 1997 and 2000 and the final production increased 24%, whereas the quasi rent of variable costs increased only 11%.…”

Section: Discussionmentioning

confidence: 55%

“…The economic results, in conjunction with the data on catch and stock size (Pérez, 2003(Pérez, , 2005, allow us to explain the benthic crustacean fishery dynamics off northern-central Chile from 1997 to 2000 and the consequences observed later.…”

Section: Discussionmentioning

confidence: 93%

“…At the same time, the nylon shrimp biomass decreased 54% (Pérez, 2005) and the squat lobster biomass decreased 67% (Pérez, 2003). The decrease in biomass, followed by a lower CPUE (SUBPESCA, 2003(SUBPESCA, , 2005a(SUBPESCA, , 2005bPérez 2003Pérez , 2005Quiroz et al, 2005), forced companies to make a greater effort in terms of the number of fishing trips, which caused an important increase in the production costs with the consequent loss of the expected profit. If the fixed costs related to the fleet, processing, and administration are considered, the economic benefits would decrease even more significantly.…”

Section: Discussionmentioning

confidence: 99%

“…1) between September 1997 and August 2000. The analysis was based on the bio-technological model developed for nylon shrimp (Heterocarpus reedi) and squat lobster (Cervimunida johni, Pleuroncodes monodon) (Pérez, 2003(Pérez, , 2005. This model was fed data and information provided by the fishing companies through the daily monitoring of the spatial and temporary dynamics of effort and the CPUE (ton·trawl -1 ) displayed by the fleet on nylon shrimp and squat lobster (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, Pérez (2005) described the dynamics of biomass, catches, and catch per unit of effort (CPUE, ton·trawl -1 ) for the Heterocarpus reedi nylon shrimp fishery off northern Chile. The CPUE for both nylon shrimp and squat lobster progressively decreased from 1997 to 2000 (SUBPESCA, 2005a(SUBPESCA, , 2005bQuiroz et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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An economic analysis of the Heterocarpus reedi and Cervimunida johni fisheries off northern-central Chile, from 1997 to 2000

Pérez

2007

Investig. mar.

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ABSTRACT. The economic effects resulting from the diminishing catch per unit of effort (CPUE) in the nylon shrimp and squat lobster fishery off northern-central Chile from 1997 to 2000 were evaluated. A bio-technological simulation model was used that describes the physical and biological performance variables for the fishery. An economic submodel was incorporated to the original model in order to perform an integrated analysis of the crustacean fishery, including the catch and processing sub-sectors. The economic results, in conjunction with the data on catch and stock size, explained this fishery's dynamic off northern-central Chile during the study period. The total catch increased 21% between 1997 and 2000 and the final production increased 24%, but the quasi rent of the variable costs increased only 11%. The same period saw costs associated with fishing trips increase 117% and the total production cost increased 93%. The study results showed that part of the profits were lost due to the decreased biomass of both resources and the excessive increase in the average production costs, which were explained by the increased fishing trip costs. In order to obtain a better representation of the fishery's performance, economic references points should be incorporated to complement the traditional biological (biomass) and fishery (CPUE, catches) proxies.Key words: economics, nylon shrimp, squat lobster, quasi rent, Chile.Análisis económico de la pesquería de Hetercorpus reedi y Cervimunida johni en la zona centro norte de Chile, periodo 1997-2000 RESUMEN. Se analizó el efecto económico debido a la disminución de la captura por unidad de esfuerzo (CPUE) en la pesquería de camarón nailon y langostino amarillo en la zona norte y central de Chile durante el periodo 1997-2000. Se utilizó un modelo de simulación biológico-tecnológico que da cuenta de variables de desempeño físicas y biológicas. A este modelo se le incorporó un submodelo económico para realizar un análisis integrado de la pesquería de crustáceos que incluye el subsector de captura y procesamiento. Los resultados económicos obtenidos, sumados a los resultados de captura y de tamaño del stock permiten explicar la dinámica de esta pesquería en la zona centro-norte de Chile durante el período 1997-2000, donde la captura aumentó en 21%, la producción final aumentó en 24%, pero la cuasi renta de los costos variables aumentó sólo 11%. En este mismo período los costos por marea incrementaron 117% y el costo total de producción aumentó 93%. Los resultados mostraron que parte del beneficio económico se pierde debido a la disminución de la biomasa de ambos recursos y a un aumento excesivo en los costos medios de producción, que fueron explicados por el aumento en los costos de marea. Se recomienda incorporar puntos de referencia económicos en orden a tener una mejor representación del desempeño de la pesquería, como un complemento a los indicadores de desempeño biológicos (biomasa) y pesqueros (CPUE y captura) usados tradicionalmente.Palabras clave: economía, camarón ...

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Section: Discussionmentioning

confidence: 55%

Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

An economic analysis of the Heterocarpus reedi and Cervimunida johni fisheries off northern-central Chile, from 1997 to 2000

Pérez

2007

Investig. mar.

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Ovarian maturity, egg development, and offspring generation of the deep-water shrimp Plesionika edwardsii (Decapoda, Pandalidae) from three isolated populations in the eastern North Atlantic

Triay‐Portella

Díaz

Pajuelo

et al. 2016

Marine Biology Research

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Explotación y evaluación de la pesquería de tilapia ( Oreochromis spp.) En el embalse “Zimapám” Fernando Hiriart Balderrama, Hidalgo, México

2012

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Oreochromis spp. fishing in the Fernando Hiriart Balderrama Reservior began in 1997 and its effects had never been studied before. Schaefer and Fox’s biomass dynamic model were used in order to obtain the first evaluation of this resource and to analyze the presence of record errors (or observation errors) in the annual total catch data set. The number of fishermen was used as the fishing effort unit. Schaefer´s model proved to be statically reliable: Oreochromis spp. was estimated at the maximum population size value of k = 9 000 tons and reproduction rate value at annual r = 0.730. Considering those ecological and biological strategies, Schaefer´s model showed that great biomass levels (predicted biomass) have been produced in the Zimapán reservior; however, only a small part of this biomass was exploited during the analyzed period. The results indicate that tilapia fishery in the Zimapán Reservoir was at equilibrium or was not over-fished between 1997 and 2006 because historical tilapia records observed in Schaefer´s model were far from the k parameter and below the MSY value. With this exploitation type, the fishing effort can increase to up to 7 203 fishermen (level of fishing effort at which the maximum sustainable yield is achieved (fMSY)). However, in order to avoid an increase of the non-controlled fishing effort a similar analysis is recommended with recent data. La pesca de la tilapia Oreochromis spp. en la presa hidroeléctrica Fernando Hiriart Balderrama comenzó en 1997, esta pesquería nunca ha sido evaluada. Fueron utilizados los modelos dinámicos de biomasa de Schaefer y Fox para obtener la primera evaluación de este recurso y para analizar la presencia de errores de registro (errores de observación) en la captura anual total. El número de pescadores fue usado como la unidad de esfuerzo de pesca. El modelo de Schaefer resultó estadísticamente confiable y para Oreochromis spp. fueron estimados el tamaño máximo de población en k = 9 000 tons y la tasa de reproducción en r = 0.730 anual. Considerando estas estrategias ecológicas y biológicas, el modelo de Schaefer sugirió que grandes niveles de biomasa (biomasa predicha) fueron producidas en la presa Zimapán, pero solo una pequeña parte de esta biomasa fue explotada durante el periodo analizado. Los resultados indicaron que la pesquería de la tilapia en la presa Zimapán estuvo en equilibrio o no fue sobreexplotada entre 1997 y el 2006, porque los registros históricos en el modelo de Schaefer fueron observados muy lejos del parámetro k y por debajo del valor MSY. Con este tipo de explotación, el esfuerzo de pesca podría incrementarse hasta alcanzar 7 203 número de pescadores (nivel de esfuerzo de pesca en el cual se activa el rendimiento máximo sostenible (fMSY)), pero para evitar un incremento no controlado del esfuerzo de pesca, se recomienda hacer un análisis similar integrando datos recientes.

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Un modelo simple para describir la dinámica de la biomasa del camarón nailon Heterocarpus reedi en Coquimbo, Chile

Cited by 5 publications

References 13 publications

An economic analysis of the Heterocarpus reedi and Cervimunida johni fisheries off northern-central Chile, from 1997 to 2000

An economic analysis of the Heterocarpus reedi and Cervimunida johni fisheries off northern-central Chile, from 1997 to 2000

Ovarian maturity, egg development, and offspring generation of the deep-water shrimp Plesionika edwardsii (Decapoda, Pandalidae) from three isolated populations in the eastern North Atlantic

Explotación y evaluación de la pesquería de tilapia ( Oreochromis spp.) En el embalse “Zimapám” Fernando Hiriart Balderrama, Hidalgo, México

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