Plural of Trout

The Quick Answer

The plural of trout is trout.

The Plural of Trout

The plural of trout is trout.

Trout are closely related to salmon.
Young trout are referred to as troutlet, troutling or fry.

The table below shows the standard rules for forming the plurals of nouns in English.

Type	Example of Type	Forming the Plural	Plural
Most Nouns	cat scythe	add s	cats scythes
Noun Ending s, sh, ch, x or z	bus dress	add es	buses dresses
Nouns ending [consonant] o	mango zero tomato	add either s or es (There are no rules for this - you have to know.)	mangoes or mangos zeros tomatoes
Nouns ending [vowel] o	patio ratio	add s	patios ratios
Nouns ending [consonant] y	story penny	change the y to an i and add es	stories pennies
Nouns ending [vowel] y	storey () donkey	add s	storeys donkeys
Nouns ending f or fe	dwarf knife	ves and/or s (There are no rules - you have to know.)	dwarfs knives
Exceptions	goose louse	some nouns undergo a vowel or letters change	geese lice
More exceptions	salmon trout	some nouns do not change at all	salmon trout

Why Is There Confusion over the Plural of Trout?

Trout is the only way to make the noun trout plural.

Confusion arises because trout remains unchanged in its plural form. Unfortunately, there is no clever way of knowing which nouns follow which rules. You have to know.

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