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Crecimiento, mortalidad y evaluación de la población de cangrejo dorado (Chaceon chilensis) explotado en el archipiélago de Juan Fernández, Chile Growth, mortality, and stock assessment of the golden crab (Chaceon chilensis) population exploited in the Juan Fernández archipelago, Chile

Authors: Cristian Canales; Patricio M Arana;

Crecimiento, mortalidad y evaluación de la población de cangrejo dorado (Chaceon chilensis) explotado en el archipiélago de Juan Fernández, Chile Growth, mortality, and stock assessment of the golden crab (Chaceon chilensis) population exploited in the Juan Fernández archipelago, Chile

Abstract

Se analiza la información mensual de composición de tamaño recopilada en el monitoreo de la pesca artesanal sobre cangrejo dorado (Chaceon chilensis) realizado entre julio de 2005 y mayo de 2006, para evaluar los parámetros de crecimiento, mortalidad natural y puntos biológicos de referencia de los machos sobre los cuales se basa esta pesquería. Se estableció una longevidad promedio de 20 años y una mortalidad natural en torno a M = 0,27 año-1 . La talla crítica se determinó a los 110 mm de longitud cefalotorácica (Lc), que es levemente inferior a la talla de primera captura de 114 mm de Lc. De acuerdo al análisis efectuado, se explotan individuos entre 4 y 10 años de vida. Mediante análisis de equilibrio se determina que la población se encuentra en 82% de la condición virginal, que se refleja en una talla promedio en las capturas de 128 mm de Lc. Una eventual reducción de la población a un límite del 40% de la condición original, se consigue aumentando en tres veces el nivel actual de desembarques, lo que se traduciría en una talla media en las capturas de 118 mm de Lc. Finalmente, se recomiendan distintos puntos biológicos de referencia para garantizar una explotación sustentable en el tiempo.Monthly information on the size composition of golden crab (Chaceon chilensis) catches compiled while monitoring the artisanal fishery (July 2005 through May 2006) is analyzed in order to evalúate the growth parameters, natural mortality, and biological reference points in male specimens, the basis of the fishery. Average longevity was found to be 20 years and natural mortality around M = 0.27. The critical size was determined to be around 110 mm carapace length (Lc), slightly lower than that of the first catch (114 mm Lc). According to this analysis, individuals between 4 and 10 years of age are exploited. A balance analysis revealed that 82%) of the population is virginal, as reflected in an average size-at-catch of about 128 mm Lc. Tripling the current level of landings would lead to an eventual reduction to a limit of 40%> of the original population; this would result in an average catch size of 118 mm Lc. Finally, several biological reference points are recommended for guaranteeing sustainable exploitation over time.

Keywords

QH301-705.5, growth, crecimiento, Chaceon chilensis, SH1-691, archipiélago de Juan Fernández, GC1-1581, cangrejo dorado, Oceanography, evaluación, mortality, Aquaculture. Fisheries. Angling, mortalidad, Juan Fernandez Archipelago, Chile, Biology (General), golden crab, stock assessment

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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