The boat was equipped with a purseseine net (mesh size: 9 mm, bar length).
Monthly sea surface temperature (°C) was recorded during sampling using a CTD probe (Ocean 301, Idronaut).
Samples (ca.200 individuals per month) were taken in monthly intervals (October 2000 to September 2002) and were immediately preserved in formaldehyde solution (8%, buffered) prior to their transfer to the laboratory. All individuals