Loanword from English 'carp', used especially in fishing, aquarium, and culinary contexts. The native Japanese word 鯉 (こい) is more common in everyday conversation.
See also: 鯉
There are many large carp in this pond.
He caught a carp at the lake.
カープ釣りはイギリスで人気がある。
Carp fishing is popular in England.
I keep carp in an aquarium.