@a1ba The Finnish word for "fish" (kala) can also mean "file", at least in computer slang 30 years ago. (Source: Mikrobitti magazine, issue 3/1995, page 64.)
We have signs like that in the UK, usually just say No fishing, many a photo has been taken with said sign and a kingfisher (bird) standing on the sign.
I am kinda guessing the Arabic translation doesn't quite work when translated in ot English.