Changes in zooplankton biomass and structure in
relation to hidroclimatological indexes in Ría de Vigo
and adjacent shelf waters are presented for the period
1994-2000. Zooplankton biomass showed an inverse
relation with NAO, the Gulf Current and upwelling
indexes. The interannual variations in zooplankton
composition showed a gook correlation to changes in
the hidroclimatological indexes. The presence of warm
water species of Copepoda (i.e., Temora stylifera) and
Cladocera (i.e., Evadne spinifera, Penilia avirostris)
between 1996 and 1998 is reported. In the same years
a high abundance of oceanic copepods, such as:
Paraeuchaeta hebes, Centropages chierchiae, Oithona
plumifera and copepodits of Calanus helgolandicus
have been observed inside Ría de Vig
