A group of crayfish is called a cast.
It’s the same word used for a group of crabs, which makes sense given how closely related the two are. Crayfish are freshwater relatives of lobsters, built along the same basic body plan, and while they’re found in rivers, ponds, and streams rather than the ocean, the language used to describe them borrows from the same crustacean-wide tradition as their marine cousins.
What Is a Group of Crayfish Called?
The term used for a group of crayfish is a cast of crayfish. It’s the same collective noun applied to crabs, a borrowed, theatrical word rather than a term coined specifically for crayfish, but it’s the one that’s stuck as the standard reference for the species.
Where Did the Name Come From?
Like “cast of crabs,” this almost certainly isn’t a term with roots in the old medieval hunting-term tradition cataloged in the Book of Saint Albans (1486). Crayfish weren’t hunted quarry in that sense, so the word doesn’t trace back to that lineage. It reads more like a shared, borrowed label applied across the wider crustacean family, “cast” evoking a theatrical company assembled together, rather than a term with a documented, species-specific origin.
It’s worth being upfront that there isn’t a well-documented, unique explanation for why crayfish share this exact word with crabs rather than having their own distinct collective noun. The honest answer is that the term appears to be reused across similar-looking crustaceans rather than independently coined for each one.
Crayfish Facts
- Habitat: Crayfish live in freshwater rivers, streams, lakes, and ponds around the world, usually hiding under rocks, logs, or in burrows dug into muddy banks.
- Social behavior: Crayfish are generally solitary and territorial, similar to their lobster relatives, so “cast” is a borrowed, whimsical word rather than a biologically descriptive one, though many crayfish do share burrows or shelter in numbers when suitable hiding spots are limited.
- Diet: Crayfish are omnivorous, eating algae and plant matter, scavenging dead organic material, and hunting small invertebrates like insect larvae, worms, and snails, especially at night.
- Lifespan: Most crayfish live around 2-7 years depending on species, though some larger, slow-growing species, like the Tasmanian giant freshwater crayfish, can live up to around 40 years.
- Regrowing limbs: Like other crustaceans, crayfish can regenerate lost claws and legs over successive molts if they’re injured or lose a limb to a predator.
Example Sentences
- A cast of crayfish darted backward under the creek bank when the shadow passed overhead.
- We found a cast of crayfish sheltering beneath a single flat rock.
Other Names for a Group of Crayfish
Explore the collective noun for crayfish in more depth:
Frequently Asked Questions
What is a group of crayfish called?
A group of crayfish is called a cast, the same collective noun used for crabs.
Why do crayfish and crabs share the same collective noun?
There’s no well-documented reason. The term appears to be a shared, borrowed label applied across similar-looking crustaceans rather than independently coined for each species.
Are crayfish related to lobsters?
Yes, crayfish are freshwater relatives of lobsters, sharing a similar body plan but living in rivers, streams, and ponds instead of the ocean.
Do crayfish actually gather in groups?
Crayfish are generally solitary and territorial, so cast is more of a whimsical label than a description of true social behavior, though they sometimes share burrows or shelter together when hiding spots are scarce.
How long do crayfish live?
Most crayfish live around 2-7 years, though some large, slow-growing species like the Tasmanian giant freshwater crayfish can live up to around 40 years.
Related: Collective Nouns for Crustaceans