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Latin american journal of aquatic research

On-line version ISSN 0718-560X

Abstract

CANTILLANEZ, Marcela; AVENDANO, Miguel; ROJO, Manuel  and  OLIVARES, Alberto. Reproductive and population parameters of Thais chocolata (Duclos, 1832) (Gastropoda, Thaididae) in La Rinconada marine reserve, Antofagasta, Chile. Lat. Am. J. Aquat. Res. [online]. 2011, vol.39, n.3, pp.499-511. ISSN 0718-560X.  http://dx.doi.org/10.4067/S0718-560X2011000300010.

Reproductive and population parameters of Thais chocolata that would contribute to the validation of the current extraction standards were obtained by performing a study in the protected area of La Rinconada Marine Reserve, Antofagasta, Chile, from December 2008 to January 2010. In terms of reproduction, the results revealed asynchronic gonad development in the population, with specimens in different stages of maturity throughout the year. Mature individuals were distributed between 5 and 13 m depth, forming aggregations at 5 m depth during much of the year. Periods of greater maturity were observed from July to August and November to January, with the most important aggregations at the end of both periods. A relationship was observed between the months with the greatest maturity and aggregations and the months with the highest daily temperature fluctuations. At the population level, the results allowed us to estimate 2.3*106 individuals, with 39% of this population over the minimum legal size (55 mm). The relatively slow growth estimated for this population was probably influenced by the high variability of the bottom temperature in this area. The critical size and size at first maturity of the population were higher than the minimal legal size, making it is necessary to review the current fishing regulation for this species. The effectiveness of the State marine reserves in the conservation of this marine resource was demonstrated.

Keywords : snail locate; reproductive aggregation; fisheries biology; marine protected area; northern Chile.

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