INVESTIGADORES
CASAUX Ricardo Jorge
artículos
Título:
Trends in relative abundance of fjord Notothenia rossii, Gobionotothen gibberifrons and Notothenia coriiceps at Potter Cove, South Shetland Islands, after the commercial fishing in the area.
Autor/es:
BARRERA-ORO E.; MARSCHOFF E.; CASAUX R,
Revista:
CCAMLR SCIENCE
Editorial:
C C A M L R TI
Referencias:
Lugar: Hobart; Año: 2000 vol. 7 p. 43 - 52
ISSN:
1023-4063
Resumen:
Abstract. A monitoring program of demersal fish in inshore sites of the
South Shetland Islands has continued in Potter Cove from 1991 to 1999, covering
a continuous sampling period of sixteen 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. An increasing trend of N. rossii catches was observed, but the actual levels of relative
abundance of this species and G.
gibberifrons are well below those found in the early 80´s. 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 sixteen 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.