For the monitoring of wild species the annual harvest, or the number of animals killed, and the size of the spring population are of interest. The spring population consists of the adult animals and constitutes the propagation capital of the population. According to international law, this propagation capital must remain sufficiently large to guarantee the "favourable conservation status" of the population.
One of the INBO tasks is analysing trends in the size of the annual harvest and the spring populations of wild species. The main source of information for these analyses are the annual hunting bag statistics and spring data of the wildlife management units.
The annual hunting bag statistics and spring data of the game management units are collected in a centralized database.
Every year, an overview of the absolute number of killed animals per species and relative hunting bag statistics per 100 ha are published. Every two years, a more detailed analysis is published in the Nature report.