Blackshadows09

Hi, I was wondering if someone could tell me how to acquire the expert fishing (150-200)? normally I would go to old man hemming in booty bay, since he is supposed to have a book for you to buy, but he does not. the trainer will only give me the option to learn artisan fishing (200-275) next so I can't just learn it from a trainer unless I'm missing something. If anyone can please help and let me know what to do. I'm on the Legion server on Sylvanas