Lernaea cyprinacea is a species of parasitic crustacean belonging to the family Lernaeidae.

[1] It may be native to Eurasia,[2] and has been introduced to the United Kingdom[1][3] and the United States.

[1][2] It develops optimally at temperatures between 23 and 30 °C (73 and 86 °F).

[4] It is regarded as a major pest in aquaculture.

[4]