Regular flights over the Bay of Biscay by the French Customs Air Servi
ce, have enabled us to record more precisely, from 1989 to 1995, the g
eographical locations of French and other European Community (EU) fish
ing boats. Data showed three main 'metiers' within the Bay of Biscay f
ishing fleet: French and Spanish bottom trawlers (61 %), French gill-n
etters and Spanish longliners: More than 80 % of gill-netters worked i
nside the territorial sea (12 nautical miles) and 60 % of them worked
south of Noirmoutier (47 degrees N). Longliners moved according to the
seasons, from the edge of the continental shelf to the 50-100 m sound
ing lines. Since they work at night, only few pelagic trawlers have be
en recorded (records being made in daylight). The potters, liners and
other small 'metier' boats of the bay were only located along the coas
t. The position of the French boats' positions according to their regi
stration district showed that most boats worked close to their landing
ports and that the overlap is small between the areas of two neighbou
ring fleets. Further analysis of the spatial distribution of boats in
the French EEZ showed that Spanish boats were mainly recorded in the s
outhern part of the Bay of Biscay, and that most were Basque. Belgian
and Dutch beam trawlers fished their quota of sole off the 'Pertuis Ch
arentais', the Gironde estuary and the 'bassin d'Arcachon'. The 100 m
sounding Line appeared to constitute a demarcation line between the ma
jor fraction of the French fleet and other EU fishing boats. Although
some fishing areas were only visited by boats practising a particular
'metier', others were coveted by everybody and, consequently, were are
as with the most serious risk of conflicts. (C) Elsevier, Paris.