"You turn the fish over."

Translation: Girate il pesce.

[temporalthings]

il pesce = the fish

i pesci = the fish

Girate i pesci should be an acceptable translation for "You (pl) turn the fish over"

[wiplala]

isn't "the fishes" correct plural in English?

[VonSmallhausen]

Both fish and fishes are correct. Most people use fish when they talk about a group of the same species (e.g. These fish are goldfish) and use fishes when talking about a group of different species.

http://grammarist.com/usage/fish-fishes/

[wiplala]

Thanks, that helps!