INVESTIGADORES
CASAUX Ricardo Jorge
congresos y reuniones científicas
Título:
Expansion patterns of the Chinook salmon in a trans-national Pacific river at Patagonia, Argentina
Autor/es:
DI PRINZIO C; CASAUX R,
Lugar:
Mar del Plata
Reunión:
Congreso; BIOLEF 2011; 2011
Institución organizadora:
BIOLEF
Resumen:
The presence of the Chinook salmon (Oncorhynchus tshawytscha), in trans-national
Pacific rivers at Patagonia (Argentina)
has been documented since 1980, concurrently with the expansion of the
aquaculture activities in Chile.
In order to understand the patterns of distribution of this species at
northwest Chubut we initially focused our studies at the Futaleufú River(43°08´S; 71°35´W). During sampling performed
from January to May (2010 and 2011) we
carried out censuses by snorkeling to determine the presence of the Chinook
salmon at different sections of the river. As a result, 50 individuals
were caught, which were measured, weighted and sexed. We took tissue samples
for posterior DNA analyses and collected scales and otoliths for ecotype and
age determination. The comparison of our information with that obtained
previously at the Futaleufú River indicated that the individuals has been
increased in number, length and mass as revealed in records from 2000 to the
2011. Recently, we confirmed the presence of the Chinook salmon at the Percy
stream (42°59´S; 71°29´W), a tributary
of the Futaleufú river. In this work we discuss population attributes related
with ecotype and age. The establishment of Chinook salmon populations in the
region appears to be an ongoing process. In consequence, to document this
process in real time is an opportunity to evaluate risks associated Chinook
salmon expansion.