Latitudinal changes in the Patagonian grenadier (Macruronus magellanicus) pelagic fishery off central-southern Chile (1986-2003)

Luis A. Cubillos, Katty Riquelme, Billy Ernst


DOI: https://doi.org/10.3856/vol37-issue2-fulltext-1

We analyzed spatio-temporal changes in Patagonian grenadier catches by the purse-seine fleet off central-southern Chile (34º-41º30’S) in order to check the hypothesis that the juvenile fraction of the population migrates northward in spring. Log-book data from 1986 to 2003 were used to calculate the center of gravity of and variance of each catch. We proposed that, if the fleet follows the migratory behavior of the juvenile fraction, the centers of gravity of the catches will migrate from south to north as the fishing season progresses. Nevertheless, the centers of gravity migrated northward in only four cases. Unexpectedly, the centers of gravity remained stationary within each fishing season. Now we propose that, in spring, a resident juvenile fraction of Patagonian grenadier increases its accesibility and vulnerability in the surface waters due to the environmental conditions, characterized by the dominance of upwelling events, and rather than a northward migration.

Cubillos L, Riquelme K, Ernst B. Latitudinal changes in the Patagonian grenadier (Macruronus magellanicus) pelagic fishery off central-southern Chile (1986-2003). Lat. Am. J. Aquat. Res.. 2017;37(2): 121-129. Available from: doi:10.3856/vol37-issue2-fulltext-1 [Accessed 9 Dec. 2019].
Cubillos, L., Riquelme, K., & Ernst, B. (2017). Latitudinal changes in the Patagonian grenadier (Macruronus magellanicus) pelagic fishery off central-southern Chile (1986-2003). Latin American Journal of Aquatic Research, 37(2), 121-129. doi:http://dx.doi.org/10.3856/vol37-issue2-fulltext-1