The cooperative aims to manage the fish farming rights it holds on the Griesbach, including its tributaries, as far as they are located within the municipal boundaries of Sumiswald, through joint self-help. The cooperative's own management of these waters is to be carried out through rational fish farming or fishing, or by leasing the fishing rights to these waters for the same purpose, either as a whole or in several sections. The fight against poaching. The increase of the fish stock by introducing young fish into the waters. The creation of all facilities suitable for achieving a rational and sustainable fish catch, or the rental of such facilities, all as decided by the General Assembly.