I would think women passengers would complained to the officals,to the captain,chief officer,etc...women and reptiles/bird eating spiders do not mix,that was my main point.
Probably shipping lines and cruises will come up with some way to include pets for an extra fee. I read somewhere that there is a pet airline. Also a person can bring a pet on an airplane as long as it is sedated in one of the holds below. Granted one cannot walk around a plane like on a ship though.