Cephalopod paralarvae and upwelling conditions off Galician waters (NW Spain) |
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Authors: | Rocha F; Guerra ; Prego R; Piatkowski U |
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Institution: | Instituto de Investigaciones Marinas (CSIC), C/Eduardo Cabello 6, 36208 Vigo, Spain; Institut fur Meereskunde, Universitat Kiel, Dusternbrooker Weg 20, D-24105 Kiel, Germany |
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Abstract: | A total of 103 cephalopod paralarvae were sampled during June 1995 in
Galician waters (NW Spain). Samples were taken with Bongo nets of 300 and
500 m mesh size at 48 sampling stations along
10 transverse transects ranging from 80 to 600 m water depth. Paralarvae of
loliginid squid were most abundant (40%). The
Rhynchoteuthion paralarvae of ommastrephid squid
accounted for 25%, whereas sepiolids comprised 23% of the total sample.
Octopods were scarce, at only 6.6%. Other cephalopod families accounted for
5%. Sizes of paralarvae ranged from 1.0 to 7.1 mm mantle length.
Temperature and salinity distribution showed the presence of an intense
upwelling during the survey period. The sampling data obtained before and
during the presence of upwelled water off Rias of Pontevedra and Vigo
(southern zone) showed that paralarval cephalopod abundance and
distribution were closely related to the upwelled Eastern North-Atlantic
Central Water (ENACW).
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