As appears from the remarks hitherto made, the restrictions which are
immediately required for the preservation of the shell resources are--
(1) The imposition of size limits for the protection of young mussels.
(2) The adoption of a plan of rotation of closed regions, whereby the
mussel beds may be given the best opportunity for propagation and
growth.
We do not at this time advocate any other limitations, and it will be
attempted to show that these are so simple to apply and so promising of
effectual conservation that it is strongly advisable not to complicate
the situation by a needless multiplicity of restrictions. These two
measures will be fully discussed in subsequent sections of the paper.