So many times I read postings from or speak to Thais or Chinese from the PRC and they have problem with the word fish.  So here is the lesson.99.999% of the time the word to use is fish, not fishes.  If you use the word fishes it sounds like you are either not educated or are a young child who hasn't learned this yet.  Here are some examples for you to see the use of the word fish in context.You have one fish.You have five fish.There are many fish in the sea.

I see a school of fish.Enjoy your day and have a tasty fish dinner tonight.Primetime 

That's a pretty kettle of fish

anadromous fish

bait fish

big fish

butterfly fish

can of fish

canned fish

carnivore fish

catadromous fish

draft of fish [AE] draught of fish [bE]

fillet of fish

fish blood

fish cake

fish finger

fishy fingers

fish fork

fish net stockings

fish offal

fish plate

fish platter

fish poisoning

fish pond

fish stick

fish stock

fish tank

fish test

fish trap

fish world

loose fish

mosquito fish

odd fish

pickled fish

pilot fish

rainbow fish

torpedo fish

wet-fish handshake

A L L F I S H

something fishy going on

thank God we have YOU to set the record straight. you might consider becoming an English teacher in Thailand. literacy optional.

This could end up being a very long series

hahah already have nice fish cake and fish pudding

want some?

another fish story eh ....the one that got away

don't forget "fish on" and a fish called Wanda.