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Le garçon est tout fasciné par les crevettes.

Le garçon est tout fasciné par les crevettes.
The boy is completely fascinated by the shrimp.
From Lesson 277:Agreement of the adverb tout (toute, toutes)·French

Questions & Answers about Le garçon est tout fasciné par les crevettes.

Why does tout stay in its basic masculine singular form here?
In this sentence, tout acts as an adverb meaning "completely." Adverbs don't normally change their form to match gender or number. The only exception for tout is when it comes right before a feminine adjective starting with a consonant or an aspirated 'h'. Because fasciné is masculine, tout remains invariable (it doesn't change).
If we changed the sentence to be about a girl, would tout change to toute?
Yes! If the subject were La fille, the adjective would become feminine: fascinée. Because fascinée is feminine and starts with a consonant (f), the special rule for the adverb tout kicks in. You would write La fille est toute fascinée.
Why do we use par instead of de for "by" here? I thought emotions usually took de.
You are right to remember that many adjectives describing feelings take de (like fatigué de or heureux de). However, fasciné acts like a literal passive verb here, so it uses par to show the "agent" doing the fascinating, exactly like English ("fascinated by").
In English, "shrimp" can be plural without an "s". How does it work in French?
In French, une crevette is a completely normal, countable noun. To talk about multiple shrimp, you must add an s to make it crevettes. Also, because he is fascinated by shrimp in general, French requires the plural definite article les, giving us les crevettes.

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