That would appear to be a giant W. W for wang.

A fishtail which looks like a W and has got a weird colour that for me, does not make the sense I want it to make.

this fish with a rainbow tail makes no sense, but we love it anyway

magicarp with rainbow tale

magikarp says 'gay rights!'

magikarp says "gay rights!"

Sun is bewildered at a fish that is asking for gay rights.

time to repeal overfishing laws