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vol.28Exploratory survey with pots around Robinson Crusoe and Santa Clara islands, Juan Fernandez archipelago, ChileExperimental fishing survey of golden crab (Chaceon chilensis) in the Juan Fernandez archipelago, Chile author indexsubject indexarticles search
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Investigaciones marinas

On-line version ISSN 0717-7178

Abstract

ARANA, Patricio M.. Abundance and biomass estimates of golden crab (Chaceon chilensis),  in the Juan Fernandez archipelago, Chile. Investig. mar. [online]. 2000, vol.28, pp.53-68. ISSN 0717-7178.  http://dx.doi.org/10.4067/S0717-71782000002800006.

The fishery-biology aspects of the Juan Fernandez golden crab (Chaceon chilensis), and first estimates of the abundance and biomass of this resource distributed in the marine substrate surrounding Robinson Crusoe and Santa Clara islands are given. Information was obtained from samples taken within an experimental fishing survey for this crustacean, between 175 to 600 m depth, from March to June 1997. The theoretical area of influence methodology was used to estimate the abundance and biomass. Due to the degree of uncertainty of the variables employed, some parameters were sensibilized in order to obtain a range of estimates, along with its most likely value. Results indicate that the fishery of this resource is characterized by its catch mainly composed by males (97,8%), in the different types of traps used as well as in the whole bathymetric range surveyed. Specimens' length were between 84 and 147 mm of cephalothoraxic length. Maximum and minimum observed total weights were 250 and 1410 g respectively. The mean weight of a specimen (male) was 863 g. First most likely estimate of the golden crab available biomass, having sensibilized the area of influence of the trap, was determined to be 995,3 tons, that is a mean density of 2,9 individual/1000 m2 and a maximum sustainable yield (MSY) of 75 tons. In the worst of the estimates scenery a MSY of 19 tons was obtained, and in the most optimistic scenery it reached 168 tons

Keywords : golden crab; Chaceon chilensis; abundance; biomass; MSY; Juan Fernandez archipelago; Chile.

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