versión On-line ISSN 0717-7178
ARANA, Patricio M. y VEGA, Rodrigo. Effort, catch and catch per unit of effort in the Juan Fernandez spiny rock lobster fishery (Jasus frontalis), during the 1996-1997 fishing season. Investig. mar. [online]. 2000, vol.28, pp. 117-133. ISSN 0717-7178. doi: 10.4067/S0717-71782000002800009.
The effort, catches and yields of the Juan Fernandez spiny rock lobster (Jasus frontalis), during the 1996-1997 fishing season. For this purpose the monthly information given by the fishermen in ad-hoc forms was used in the islands Robinson Crusoe-Santa Clara, Alejandro Selkirk and Desventuradas (San Félix and San Ambrosio islands). This information was complementary records obtained directly by technical personnel on board of artisanal boats operating off Robinson Crusoe and Santa Clara islands. The latter enabled us to gather antecedents referred to the catch per trap by fishing zone and depth. For the analyzed season, the total landings of this resource reached 53,543 units (50 ton). From the total, 26,219 specimens (49%) were extracted around Robinson Crusoe and Santa Clara islands, 17,929 (33%) in Alejandro Selkirk island and 9,395 (18%) from Desventuradas islands. For the first group of islands, the percent of commercial lobster over the total catch reached 7.5%. The yields of commercial specimens varied monthly between 0.53 y 0.59 lobsters/trap, with the maximum values between 112 and 137 m depth (61 y 75 fathoms) and in zones located to the south and southwest of the islands. The effort, as the number of total traps settled, was concentrated in the southwest area of Santa Clara island. Traps are settled at the beginning of the season preferentially near the coast and, early in December, they are displaced towards greater depth waters, concentrating the traps towards the end of the season between 112 and 165 m (61 y 90 fathoms). Comparatively, the maximun average yield of 174 lobsters per trip off Desventuradas islands were remarkable higher than the average yield, of 31.6 and 10.2 lobsters per trip from Alejandro Selkirk island and Robinson Crusoe-Santa Clara islands, respectively
Palabras clave : effort; catch; CPUE; spiny rock lobster; Jasus frontalis; Juan Fernández archipelago; Chile.