MANAGEMENT O F FISHERY RESOURCES
33
FIG. 11. A whale catcher with its catch. A photograph taken in 1952 during the rich
years of post-war whaling. (Photo: F.A.O.)
stocks were probably less than the annual catches which could have
been sustained indefinitely if all three stocks had been maintained and
harvested at the optimum level. Ideally, therefore, separate limits
(catch or effort quotas) should be set for each species, but this raises
the problem when two or more species are caught together in varying
proportions of what happens when the limit for one species has been
reached. Often it is then uneconomic or impracticable to carry on a
fishery directed solely on the other species.
The experience of the International Whaling Commission does,
however, suggest a possible technique for managing multi-species
fisheries; that is by setting an overall quota, with catches of each
33
FIG. 11. A whale catcher with its catch. A photograph taken in 1952 during the rich
years of post-war whaling. (Photo: F.A.O.)
stocks were probably less than the annual catches which could have
been sustained indefinitely if all three stocks had been maintained and
harvested at the optimum level. Ideally, therefore, separate limits
(catch or effort quotas) should be set for each species, but this raises
the problem when two or more species are caught together in varying
proportions of what happens when the limit for one species has been
reached. Often it is then uneconomic or impracticable to carry on a
fishery directed solely on the other species.
The experience of the International Whaling Commission does,
however, suggest a possible technique for managing multi-species
fisheries; that is by setting an overall quota, with catches of each