No one keeps specific counts on how many trout there are in the world.
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The Sea Trout
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The plural of trout IS trout.
There are about 43 calories in 1oz of grilled trout.
The noun "trout" is both singular and plural.For example: "I caught a bunch of trout" and "I caught one trout".
The Way of a Trout with the Fly has 259 pages.
The world record rainbow trout was caught in Saskatchewan, Canada and was 100.6 pounds.
A trout is a fish, and as such is a complex organism. And yes, the trout is multicellular.
It is spelled trout. An example sentence might be, "Many people enjoy fishing for trout."
Hard to know. Trout are hatched in hatcheries and then plant them in rivers.
"Trout Fishing in America" by Richard Brautigan has 144 pages in its original edition.