Wikipedia: Fish

Difference (from prior minor revision) (major diff, author diff)

Changed: 3c3

* A cold-blooded water-dwelling vertebrate? with gills, specifically "bony" fish of class Osteichthyes, "cartilaginous" fish of class Chondrichthyes, as well as various groups of "jawless" fish. May also be used in a broader sense to refer to other water-dwelling creatures such as jellyfish or cuttlefish, and even aquatic mammals that resemble piceans such as whales and dolphin?s (especially in English texts that predate modern biology).

The word fish has several senses:

A cold-blooded water-dwelling vertebrate? with gills, specifically "bony" fish of class Osteichthyes, "cartilaginous" fish of class Chondrichthyes, as well as various groups of "jawless" fish. Other aquatic animals like jellyfish and cuttlefish are not truly fish.
The flesh of a fish (in the primary sense above) used for food. May also include the flesh of other water-dwelling animals such as mollusk?s or crustacean?s (commonly called shellfish).
(As a verb) To attempt to catch fish for the purpose of food or sport.