This data package contains two unique publicly available time series of individual-based data originating from a 51-year mark-recapture study of a land-locked population of large-sized migratory brown trout (Salmo trutta) in Norway: the Hunder trout. In the period 1966-2015, nearly 14,000 adult Hunder trout have been captured and individually marked during their spawning migration from Lake Mjøsa to the river Gubrandsdalslågen. Almost a third of those individuals were later recaptured alive during a later spawning run and/or captured by fishermen and reported dead or alive. This has resulted in the first data series: a mark-recapture-recovery dataset spanning half a century and more than 18,000 capture records. The second data series consists of additional data on juvenile and adult growth and life-history schedules from half of the marked individuals, obtained by means of scale sample analysis. The two datasets offer a rare long-term perspective on individuals and population dynamics and provide unique opportunities to gain insights into questions surrounding management, conservation, and restoration of migratory salmonid populations and freshwater ecosystems.
 

Data collection is documented in detail in the accompanying data paper:

Detailed description of the data themselves (including metadata) as well as the study system and monitoring programme are provided in the accompanying data paper:

It is highly recommended to thoroughly read the data paper before using the data.

Users of the data files should cite both the data package and the associated data paper.

We further encourage parties interested in re-using the data to contact the the data package/paper authors CRN, SJM, AR or LAV for a discussion of research ideas and potential opportunities for collaboration.