INVESTIGADORES
CASAUX Ricardo Jorge
congresos y reuniones científicas
Título:
EFFECT OF A SHORE-BASED SAMPLING PROGRAMME ON NOTOTHENIA CORIICEPS POPULATIONS
Autor/es:
CASAUX R.; BARRERA-ORO E.
Reunión:
Workshop; The CCAMLR Fish Stock Assessment Working Group; 1999
Resumen:
The effect of an intensive sampling
programme on an inshore population of Notothenia
coriiceps was studied at Potter Cove, South Shetland Islands, by comparing
catch data taken in successive summers of 1992/93 to 1994/95 at one specific
zone (site 1) with those taken in the same last summer at two close but not
previously sampled zones (sites 2 and 3). The fish were caught with trammel
nets under similar sampling conditions (depth, net measurements, bottom type).
In site 1, a marked decrease in
length (TL) of the fish was observed throughout the whole period. The fish from
sites 2 (x=32.4 cm) and 3 (x=31.8 cm) exhibited no significant differences in mean length. They
were significantly larger than those
from site 1 caught in the summers of 1994/95 (x=28.8 cm) and 1993/94 (x=30.2 cm),
but were similar in size to those sampled in the summer of 1992/93 (x=31.7 cm), just when the sampling programme started in site 1.
Present results show that the size variations of N. coriiceps observed at Potter Cove were not due to a natural
decrease of the proportion of larger fish in the population, but related to an
intensive sampling effort carried out at one specific site.