Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Distribution of freshwater crayfish in Latvia.

Abstract

Information about crayfish in 404 lakes, 368 rivers and 47 reservoirs in Latvia, from various sources of literature and unpublished materials, as well as from self-gathered data from fieldwork during 1988-2018, was collated and analyzed. The occurrence and distribution of native and alien species of crayfish in Latvia, from the 1930s until today, has been described. The history of invasive alien species was analyzed and the existence of populations of 4 crayfish species (the noble crayfish - Astacus astacus (Linnaeus, 1758), the narrow-clawed crayfish - Astacus leptodactylus (Eschscholtz, 1823), the signal crayfish - Pacifastacus leniusculus (Dana, 1852) and the spiny-cheek crayfish - Orconectes limosus (Rafinesque, 1817)) that are found in Latvia was evaluated, as was their future distribution.