CreatureData

Fishhook waterflea

Cercopagis pengoi (Ostroumov, 1891)

Status not recordedcrustaceans

The fishhook waterflea (Cercopagis pengoi) is a species in the family Cercopagidae, order Diplostraca.

No freely licensed photo yet

Quick facts about the fishhook waterflea

Weight
Not recorded
Length
Not recorded
Lifespan
Not recorded
Main food
Not recorded
Habitat
Not recorded
Young per litter or clutch
Not recorded
Conservation status
Not recorded
Countries on record
Not recorded

Where does the fishhook waterflea live?

Not recorded

Where has it been introduced?

The Global Register of Introduced and Invasive Species lists the fishhook waterflea as introduced in 11 countries, and flagged as invasive in 8 of them.

  1. Estoniainvasive
  2. Finlandinvasive
  3. Latviainvasive
  4. Lithuaniainvasive
  5. Polandinvasive
  6. Russiainvasive
  7. Swedeninvasive
  8. Ukraineinvasive
  9. Canada
  10. Germany
  11. United States

Introduced means brought by people and now present; invasive means the country's checklist records an impact. A species can be native to one part of a country and introduced in another. Source: Global Register of Introduced and Invasive Species (CC BY 4.0).

Is the fishhook waterflea endangered?

No conservation assessment is recorded for this species in our sources. That is not the same as being safe: it has not been matched to an assessment.

How is the fishhook waterflea classified?

  1. kingdomAnimalia
  2. phylumArthropoda
  3. classBranchiopoda
  4. orderDiplostraca
  5. familyCercopagidae
  6. genusCercopagis
  7. SpeciesCercopagis pengoi (Ostroumov, 1891)

Synonyms Bythotrephes pengoi, Cercopagis gracillima, Cercopagis tenera

Other names and names in other languages (6)
  • Kaspischer WasserflohGerman
  • koukkuvesikirppuFinnish
  • Cladocère en hameçonFrench
  • VishaakwatervloDutch
  • rovvattenloppaSwedish
  • Puce d’eau en hameçonFrench

Catalogue of Life

Relatives of the fishhook waterflea

Other species in the same genus Cercopagis.

CompareFishhook waterflea vs Cercopagis anonyxFishhook waterflea vs Cercopagis beklemisheviFishhook waterflea vs Cercopagis cylindrataFishhook waterflea vs Cercopagis longicaudata

Common questions

Answered only where our data holds the answer.

Is the fishhook waterflea an invasive species?

In some places. The Global Register of Introduced and Invasive Species flags the fishhook waterflea as invasive in 8 countries, including Estonia, Finland, Latvia, Lithuania and Poland. It lists it as introduced in 11 in all.

What kind of animal is the fishhook waterflea?

The fishhook waterflea (Cercopagis pengoi) belongs to the family Cercopagidae in the order Diplostraca.

Sources and how to cite this page

Data as of 2026-11-14. How this page is put together.

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APA

CreatureData. (2026). Fishhook waterflea (Cercopagis pengoi). Retrieved from https://creaturedata.com/animals/fishhook-waterflea

MLA

“Fishhook waterflea (Cercopagis pengoi).” CreatureData, 2026, https://creaturedata.com/animals/fishhook-waterflea.

BibTeX
@misc{fishhook_waterflea_2026,
  title = {Fishhook waterflea (Cercopagis pengoi)},
  author = {{CreatureData}},
  year = {2026},
  url = {https://creaturedata.com/animals/fishhook-waterflea},
  note = {Data as of 2026-11-14}
}