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Signal Crayfish

Crustaceans

The signal crayfish is a freshwater crayfish native to rivers, lakes, and streams of the Pacific Northwest of North America. It is identified by a smooth, robust body and a small white or pale turquoise patch at the hinge of each claw, the mark that gives the species its common name. Introduced widely to Europe, the United Kingdom, and Japan during the twentieth century for aquaculture, it has become one of the most damaging invasive crayfish species outside its native range. It carries a fungal pathogen known as crayfish plague without being harmed by it, while spreading the disease to native crayfish species that have no resistance and die in large numbers on contact. In its introduced range it also burrows aggressively into riverbanks, damaging banks and levees, and outcompetes native crayfish for food and shelter. Within its native Pacific Northwest range, by contrast, it lives as an unremarkable and ecologically balanced part of the freshwater community.

Facts

Classification

Diet

Omnivore 1

System (Realm)

Freshwater 2

Threats

Invasive and Other Problematic Species, Genes and Diseases 2

Relationship to People

Invasive or Introduced Species 2

Living or Extinct

Yes 3

Comparison

NatureServe Rank

GNR Unranked 4

CITES Appendix

Not Listed 5

Scientific Name

Pacifastacus leniusculus 3

Conservation Status

Least Concern 2

Connections

Child Taxon Of

Source Signal Crayfish (Wikidata)

In Biome

Source Wikipedia: Signal crayfish

In the Other Atlases

Found In

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Also in Geography Atlas: where this subject is found.

Sources

1. SeaLifeBase: Pacifastacus leniusculus summary

SeaLifeBaseBiology

Quote, Biology

This is an omnivorous species (Ref. 96489 ).

View the Source

2. Wikipedia: Signal crayfish

threat (MediaWiki batch-API article extract states it plainly)
leniusculus has become an established invasive species found across North America, Europe, and Japan, displacing many of the regions’ native species.
human-interaction (MediaWiki batch-API article extract states it plainly)
leniusculus has become an established invasive species found across North America, Europe, and Japan, displacing many of the regions’ native species.
system (MediaWiki batch-API article extract states it plainly)
Pacifastacus leniusculus, commonly known as the signal crayfish, is a species of freshwater crayfish in the family Astacidae, native to western North America.
Infobox: status
LC
In Biome: Freshwater, Wikipedia intro: "Pacifastacus leniusculus, commonly known as the signal crayfish, is a species of freshwater crayfish in the family Astacidae, native to western North America. T..."

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3. Signal Crayfish (Wikidata)

Wikidata

Wikidata Q693000 (P225 taxon name)
Statements section, conservation status (P141)
IUCN Red List conservation status (Wikidata property P141): least concern.
Child Taxon Of: Decapoda, Wikidata parent-taxon (P171) chain

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4. NatureServe Explorer: Pacifastacus leniusculus

NatureServe ExplorerGlobal rank (roundedGRank)

Quote, Global rank (roundedGRank)

"roundedGRank": "GNR"

View the Source

5. UNEP-WCMC Species+ database (CITES Secretariat): Species+: Animalia

UNEP-WCMC Species+ database (CITES Secretariat)Species+ taxon_concepts, id 23

Quote, Species+ taxon_concepts, id 23

"cites_listing":"I/II/III/NC","eu_listing":"A/B/C/D/NC","higher_taxa":{"kingdom":"Animalia","phylum":null,"class":null,"order":null,"family":null},"synonyms":[],"common_names":[{"name":"Animals","language":"EN"},{"name":"Fauna","language":"EN"},{"name":"Animaux","language":"FR"}],"cites_listings":[]

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