Breaker size for Yamaha 30 HP

[Lannabulls]

Hi, sorry for my question, I am a "motor beginner", first time ever I own an outboard motor. For my Yamaha 30 HP, do I need to install a breaker on the "+ cable" between motor and battery?
If yes, how many amps breaker should be rated?
Thanks so much for your help

 

[boscoe]

No.