Genetic population structure in the Chilean jack mackerel, Trachurus murphyi (Nichols) across the South-eastern Pacific Ocean
Silva, Andrea X.
Ojeda, F. Patricio
Cita de ítem
Fisheries Research 100 (2009) 109–115
The Chilean jack mackerel Trachurus murphyi, is a pelagic fish from the Carangidae family that is distributed
in the South Pacific Ocean. Because this species constitutes an important economic resource
across the South Pacific and plays an important ecological role in this ecosystem there is a growing interest
in determining its population structure. In this study,we used molecular markers (mitochondrial DNA
sequences and microsatellites) from Chilean jack mackerel samples to investigate its genetic population
structure across the South Pacific Ocean. The mitochondrial DNA did not detect a genetic structure in T.
murphyi populations in the Pacific Ocean, but revealed very lowhaplotype diversity and a short genealogy
history compared to other small-pelagic species. The same general pattern of a lack of genetic structure
was found with microsatellite loci; however, a large genetic diversity was revealed with microsatellite
markers. The present results did not support the existence of different stock units for T. murphyi across the
South Pacific Ocean but a more holistic approach will be necessary to determine an adequate management
strategy for this fishery.