Let's see, if I recall correctly, carp was the most eaten food fish in the world until the aquarium fish the talapia took over it because of their rapid growth.
I must admit, I've had a few carp in my life, they are edible, however eating other fish have made me picky and carp are not on the top of my list of fish targeted to eat. And as a side note I've even tried farm raised Japanese koi sashimi with miso paste in Japan. It's all about how you psychologically look at it. Some say "yuck" at sushi and sashimi while others love it. How about the next couple of other examples: caviar and truffles.
I think every culture will have some food we are not accustomed to seeing on our plates or bowls but keeping an open opinion will keep better communications between cultures and less embarrassment at times.