Meaning of the word "fish"

fish
any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills
[noun]
Examples:
the shark is a large fish
in the living room there was a tank of colorful fish
the flesh of fish used as food
[noun]
Examples:
in Japan most fish is eaten raw
after the scare about foot-and-mouth disease a lot of people started eating fish instead of meat
they have a chef who specializes in fish
catch or try to catch fish or shellfish
[verb]
Examples:
I like to go fishing on weekends