abstract Eduardo Flores 04-02 2015.eps

abstract Eduardo Flores 04-02 2015.eps

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> JEUDI 4 FÉVRIER 2016, 11h \ 11h45
Population segregation of the southern hake
(Merluccius australis) in the North Chilean Patagonia
(41º-47º S)
Merluccius australis (Hutton, 1872) is an important fishing resource widely distributed in Chile
from 35º to 55º S. Spawning grounds associated with submarine canyons between Guafo and
Guamblin islands (offshore zone) have been identified in technical reports on stock assessments.
Further, detections of early-life stages in the inner Sea of North Chilean Patagonia show that
spawning also occurs there. However, no information is available on whether this results from
individuals migrating between inshore and offshore spawning grounds or from distinct resident
subpopulations. Morphometric differences in eggs have been highlighted, eggs from the outer
sea being larger. The size of the spawning fraction as well as female fatty acid contents also
exhibited marked differences between the two areas, supporting the hypothesis of a
subpopulation residing in inner waters and spawning in channels and fjords.
This project aims to test for the hypothesis of the existence of sub-populations of M. australis
which spawn simultaneously during winter. The methodology includes 1) a review of the data
from technical reports, 2) the identification of gaps in knowledge regarding the life cycle of the
southern hake, 3) the filling of these gaps or collection of similar information on species of the
same genus in order to, 4) implement an individual based model for the southern hake to assess
the connectivity of the early life stages in the North Chilean Patagonia.
Eduardo Alberto Flores Barraza
par
Doctorant Departamento de oceanografía, Universidad de concepción, Chili
Salle Mont St-Clair, Station Ifremer, avenue Jean Monnet, Sète
UMR MARbec (IRD, Ifremer, Université de Montpellier, CNRS) ✆ 04 99 57 32 50 - 04 67 14 47 32 \ www.umr-marbec.fr
Retransmission en direct sur https://rendez-vous.renater.fr/marbec
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Claire.Saraux@ifremer.fr
sebastien.villeger@umontpellier.fr
francois.guilhaumon@ird.fr
Vincent.Ouisse@ifremer.fr
Jeudi 11 février, à Montpellier
David McKenzie
(CNRS, UMR MARBEC)