i'm young so I can't offer wisdom, but i'm sure there are women for fishing and not for fishing. if it's so important to you that you have to test out her feel for the water on the first date to determine the relationship then best of luck
my girlfriend and I were friends for a year before I came to my senses so we didn't have that awkward "get to know each other" stage. I'm extremely confident in us because of that. this summer we were @ a bar in wellfleet for dinner. After dinner, waiting for the restaurant to clean up for the night time crowd she spotted fish breaking and insisted I get a pole from my car. I only coached her that night. she did 100% of the work. now she's really into it. not 100% as me. she's a very busy girl but she has drive. Might even fish together in the keys this winter
bottom line is I didn't force it on her, and there's no pressure for us to fish together or for me to "take her fishing." It just works. and we're damn happy.