'72 23ft 305 I/O - Leaving it in the water during fishing season

[keith]

Hi Everyone. I just bought my first Seacraft and I am wondering about leaving it in the water during fishing season in the San Francisco Bay. I bought it from a friend of mine who owned it for 35 years. He is a very good mechanic and put a new Mercruiser alpha one outdrive and 305 engine in it about six years ago. The package has 280 hours on it. I am concerned with water getting into the transom and causing damage. This is the third engine in the boat and he said the transom didn't show any signs of rot. Do you guys recommend taking the unit off and re-sealing it before berthing it?
He also said he used silicone to seal it to the transom. It says in the instructions you don't have to but it sounds like a good idea.

Thanks, Keith