* Most commonly, "chub" refers to the European chub (*Leuciscus cephalus*), which is freshwater**. It is found in rivers and streams across Europe.
* Other chubs are also freshwater fish. For example, the creek chub (*Semotilus atromaculatus*) and the hornyhead chub (*Nocomis biguttatus*) are common freshwater fish in North America.
* There are also a few saltwater fish species called "chub", such as the black chub (*Girella nigricans*) found in the Pacific Ocean.
Therefore, to be sure about whether a chub is freshwater or saltwater, you need to know the specific species.