Operation Fish was a secret plan made by the British government during the 1980s to catch and spy on illegal fishing activities in the South Atlantic.
Okay kiddo, so imagine you have a really big toy box filled with all your toys. Pretend that some people are taking your toys without asking you, and that's not very nice, right?
Well, this is sort of what was happening with the fish in the South Atlantic. Some people were taking too many fish without permission, and it was hurting the environment and the people who depended on those fish for food and jobs.
So, the British government decided they needed to catch those people who were being mean to the fish. They couldn't just go down there and tell them to stop, because those people were breaking the law. Instead, they created a secret plan called Operation Fish to catch the bad guys without them knowing.
They used special boats and planes with big cameras to spy on where the boats that were taking too many fish were going. Just like how you might play detective when trying to find a toy you lost, the British government used their detective skills and equipment to find the bad guys.
Once they caught the boats that were being sneaky, they would tell the police to arrest them and take them to court.
And that's the story of Operation Fish, where the British government played detective to catch people who were taking too many fish without permission.