Advice Needed | Water on deck issue & Transducer growth

Basically as you will see from the video I have 2 issues. First: water on the deck not draining when the boat is stationary. Second: some serious growth on the transducer.

So basically advice is needed here about what I should do about this water on deck issue. I just want there to never be any standing water and ready to do whatever needed to achieve that.

Also, the transducer has some serious growth on it. Will this growth effect the transducer performance? And if so, how can I counteract this issue?