The fundamental rules which have been observed to govern the relations
hips among participants in the world canned-tuna trade are described,
and the developments which have occurred within the last two decades t
hat relate to projected future trends are examined. These conclusions
are then combined to project future developments of import to the vari
ous interest groups involved. Two scenarios are considered: there is a
n effective management regime, or there is no effective stock manageme
nt. A case is made that catch growth will be slow, trends in prices wi
ll be upwards, and the values thus generated will either be captured b
y the fishery for division among its participants if there is an effec
tive stock-management regime, or dissipated in excess catching capacit
y if there is not. There will be winners and losers. They are identifi
ed.