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It is indeed complicated.
But the explanation was perfect.
I just thought that from the time shrimps were cooked they cannot be considered any more animate, for this reason we say "В ресторане я...

I was wondering in russian креветки are treated also as неодушевлённое
Example:
1. In the bar I saw those girls = В баре я видел этих девушек (Genetive)
1. In Africa I saw lions = В Африке я видел...