Petromyzontidae, Bonaparte, 1831

Petromyzontidae View in CoL

A total of four lamprey species has been registered in Norwegian freshwaters. Two of these species (sea lamprey, arctic lamprey) have regularly been listed on the Norwegian Red List for Species (see Table 1 View Table 1 ). Both are still listed in 2021, with the sea lamprey listed as near threatened (NT) and the arctic lamprey as vulnerable (VU). However, only one article has been registered in the Web of Science during the 1980-2020 time period. This paper reports on lamprey as food for pike Esox Lucius Linnaeus, 1758 , and it is unclear if it relates to brook lamprey Lampetra planeri (Bloch, 1784) or river lamprey L. fluviatilis (Linnaeus, 1758) (Sandlund et al. 2016b) . What else is known about these species is usually published in Norwegian-language technical reports. Information on the distribution of two of the species (sea lamprey and brook lamprey) have recently been summarized in a Norwegian popular science journal ( Hesthagen et al. 2020, Hesthagen et al. 2021a). In total, however, there is a complete lack of basic biological knowledge about these four species in Norwegian lakes, rivers and streams.