Back when I was living at home with my parents, I spit into the garbage disposal of the sink one time and my mom FLIPPED OUT. She thought it was disgusting and inappropriate (I tried to explain to her that my saliva is all over the forks and stuff that gets washed in that very sink anyway, but she wasnt having it)
Dirty fish water surely isnt much better.
Moral of the story, dont mess with a woman's sink.
b*tches love sinks.