fɪʃ
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Fish is the usual plural form. The older form, fishes, can be used to refer to different kinds of fish.
1 [countable] a creature that lives in water, breathes through gills, and uses fins and a tail for swimmingThey caught several fish.tropical/marine/freshwater fishshoals (= groups) of fisha fish tank/pondThere are about 30000 species of fish in the world.The list of endangered species includes nearly 600 fishes.Fish stocks in the Baltic are in decline.In the pool she could see little silvery fish darting around. see also coarse fish, flatfish, sea fish, shellfish, wet fish2 [uncountable] the flesh of fish eaten as foodfrozen/smoked/fresh fishfish pieThe chef's fish dishes are his speciality.Fish forms the main part of their diet.Idioms
a fish out of water
a person who feels uncomfortable or awkward because he or she is in surroundings that are not familiar
have bigger/other fish to fry
to have more important or more interesting things to do
neither fish nor fowl
neither one thing nor another
The hovercraft has always suffered from the fact that it is neither fish nor fowl.an odd/a queer fish
(old-fashioned, British English) a person who is slightly strange or crazythere are plenty more fish in the sea
there are many other people or things that are as good as the one somebody has failed to get
Usage note: The living worldAnimalsanimals mate/breed/reproduce/feed (on something)fish/amphibians swim/spawn (= lay eggs)birds fly/migrate/nest/singinsects crawl/fly/bite/stinginsects/bees/locusts swarmbees collect/gather nectar/pollenspiders spin/weave a websnakes/lizards shed their skinsbears/hedgehogs/frogs hibernateinsect larvae grow/develop/pupatean egg/a chick/a larva hatchesattract/find/choose a mateproduce/release eggs/spermlay/fertilize/incubate/hatch eggsinhabit a forest/a reef/the coastmark/enter/defend (a) territorystalk/hunt/capture/catch/kill preyPlants and fungitrees/plants grow/bloom/blossom/flowera seed germinates/sproutsleaves/buds/roots/shoots appear/develop/formflower buds swell/opena fungus grows/spreads/colonizes somethingpollinate/fertilize a flower/plantproduce/release/spread/disperse pollen/seeds/sporesproduce/bear fruitdevelop/grow/form roots/shoots/leavesprovide/supply/absorb/extract/release nutrientsperform/increase/reduce photosynthesisBacteria and virusesbacteria/microbes/viruses grow/spread/multiplybacteria/microbes live/thrive in/on somethingbacteria/microbes/viruses evolve/colonize something/cause diseasebacteria break something down/convert something (into something)a virus enters/invades something/the bodya virus mutates/evolves/replicates (itself)be infected with/contaminated with/exposed to a new strain of a virus/drug-resistant bacteriacontain/carry/harbour (especially US) harbor bacteria/a viruskill/destroy/eliminate harmful/deadly bacteria