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Please use this identifier to cite or link to this item: http://hdl.handle.net/1834/1488

Title: Estudio de algunos aspectos del ciclo vital de la merluza de cola Macruronus magellanicus, Lonnberg, 1907.
Other Titles: Studies on some aspects of the life cycle of long tailed hake Macruronus magellanicus, Lonnberg, 1907.
Authors: Giussi, A.R.
Theses advisor: Angelescu, V.
ASFA Terms: Life cycle
Growth
Otoliths
Age determination
Reproduction
Population dynamics
Mortality
Population structure
Fishery surveys
Fishing grounds
Geographical distribution
Back calculation
Issue Date: 1996
Abstract: Long tailed hake Macruronus magellanicus, is a demersal fish,distributed in the SW Atlantic Ocean, in Malvinas Current waters,from 36° and 55°S, mainly between 50m and 200m depth. The species is also distributed in Chilenian waters in the Pacific Ocean, being caught in the Magellan Strait and the Beagle Channel. Age determination was estimated with the sagittae otoliths, in which only one ring is formed during the year. Growth parameters were calculated directly and with back calculated methodology, no differences were observed between the results. Differences in growth sexes were evident from 3 years old. The oldest age observed was 13. Different distributional areas of adults through out the year could suggest a migratory movement in northern waters of the total distributional area, in deeper waters and near the Bahía Grande. On the other hand,the presence of juveniles in different areas of the continental shelf shallower than 100m, in the San Jorge Gulf, and near Tierra del Fuego e Isla de los Estados (Argentina), should indicate spawning and hatchering grounds. Total and natural mortality rates observed between 0.3 and 0.58 being considerably higher values for a long life species.
URI: http://hdl.handle.net/1834/1488
Appears in Collections:Tesis En Ciencias Marinas

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