Why is the plural form of fish still fish?

Because in Old English, the plural form of the noun for prey did not use the word ending s or es. Therefore, the way prey is written is still traditional. However, the plural form is used for domestic animals or animals raised in a family town. In fact, there are two plural forms of fish: 1) unchanged (i.e., the original form), and 2) with es added.

fish as a noun

fish is used as a countable noun, meaning "fish". The singular form means "a fish". fish used as an uncountable noun means "fish meat".

fish is mostly in the zero plural form, but can be changed to fishes, which often means "many kinds of fish".

When fish is used as a subject in the singular, the predicate verb takes the singular form, and when it is used in the plural, the predicate verb takes the plural form.

Example sentences:

We caught three little fishes.

The fish plopped back into the river.

There is much fish on the plate.

fish as a verb

The basic meaning of fish as a verb is "to fish", "to catch fish", "to catch fish from...". ...", and by extension, "to feel out (something)", "to pull out (something)".

fish can be used as a transitive or intransitive verb. When used as a transitive verb, it can be attached to a noun such as river, lake, stream, pool, etc. as a simple object. It can be used in passive structure.

例句：

The beach is a good place to fish from.

They stood on the river bank to fish.

Have you a permit to fish in the lake?