Znaczenie pozaprodukcyjnych walorów małych zbiorników śródlądowych

Non-fishery or external values are usually understood as all uncontuable values and benefits of the inland fisheries, which are not in form of direct economic effects of the fisheries, although they depend on this activity. The problem of non-fishery values and of the resulting benefits is noticeable in both: lake fisheries and especially pond fish culture. Studies comprise 43 non-fishery values (in 6 groups) of small ponds and lakes in Olsztyn region as estimated by 347 small users of those waters.