To send content items to your account,
please confirm that you agree to abide by our usage policies.
If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account.
Find out more about sending content to .
To send content items to your Kindle, first ensure firstname.lastname@example.org
is added to your Approved Personal Document E-mail List under your Personal Document Settings
on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part
of your Kindle email address below.
Find out more about sending to your Kindle.
Note you can select to send to either the @free.kindle.com or @kindle.com variations.
‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi.
‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
An attempt has been made to determine the spawning areas of the principal fish, plaice, herring, cod, haddock, to define the spawning migrations, the nurseries where the young fish develop, etc. It is hoped it may in this way be possible to find the general laws for the appearance of biological groups …
Johan Hjort (1926)
It is widely recognized that knowledge of population structure and connectivity is vital for sustainable use of the world's marine fisheries resources. The harvest of each individual population unit should ideally be managed to account for its specific level of productivity directly. Whereas most emphasis has been placed on identifying discrete population units, much less effort has been given to the mechanisms behind stock separation. Evidence is accumulating to indicate that philopatric behaviors (stock-specific behaviors) are important, in this regard, not only in other kinds of species, but also in marine free-spawning fish species. Recent studies on herring and cod in the waters bounded by Norway, Sweden, and Denmark (Skagerrak–Kattegat) indicate that philopatric behavior is a key factor in shaping stock structure. Under such circumstances, an area depleted of its stock components can only slowly be repopulated by fish from adjacent areas. Repopulation, for example, may depend on adults successfully aggregating and reproducing at new locations, with new migratory patterns that are dependent on new behavior. This can be a very time-consuming process, and the slow formation of new viable populations units results in a bleak forecast for population recovery.
Email your librarian or administrator to recommend adding this to your organisation's collection.