INVESTIGADORES
CASAUX Ricardo Jorge
congresos y reuniones científicas
Título:
TRENDS IN RELATIVE ABUNDANCE OF FJORD NOTOTHENIA ROSSII, GOBIONOTOTHEN GIBBERIFRONS AND NOTOTHENIA CORIICEPS IN TRAMMEL NET CATCHES AT POTTER COVE, SOUTH SHETLAND ISLANDS.
Autor/es:
BARRERA-ORO E.; MARSCHOFF E.; CASAUX R.
Reunión:
Workshop; The CCAMLR Fish Stock Assessment Working Group; 1998
Resumen:
. A monitoring program of demersal fish in inshore
sites of the South Shetland Islands has continued in Potter Cove from 1991 to
1998, covering a continuous sampling period of 15 years and in Harmony Cove,
Nelson Island, in the austral summer 1995/96. The decline in trammel net
catches of fjord fishes of the species Notothenia
rossii and Gobionotothen gibberifrons in relation to the non commercially
fished Notothenia coriiceps, which
was already reported for the period 1983-1990 in a previous study, is still
evident. These results are supported by our knowledge on the diet of the piscivorous
Antarctic shag Phalacrocorax
bransfieldensis in the South Shetland/Antarctic Peninsula area in this
decade. The most likely explanation
for the decrease in recruitment to the inshore sub-populations of N. rossii and G. gibberifrons in the last 15 years is the effect of the offshore
commercial fishery in the area in the late 1970s. This interpretation is
consistent with the information on the historical offshore commercial fishing
and with the results of scientific surveys in the area.