Trash fish or actually really good eating and a plentiful food source?
Pretty much any fish you eat from yucky polluted waters is going to taste yuk. I'm still not sure what the big prejudice is against carp. I just speared 4 more on another trip to Lake Powell and cooked one up fresh with just some grass fed butter and cajun seasoning and it had a super good flavor (nothing muddy or even fishy) and great texture.
The thing is, they are an invasive, destructive to the aquatic ecosystems and compete for resources with native species. There's a lot of them out there that need to come out of our waters. No you don't get as much meat as you would think for the size of the fish, but, great news!, there's plenty out there and chuck the carcass in yer compost for fertile fishy magic.
Some of the ones I have speared have come with beautiful roe sacks. The one pictured below weighed in at 2 pounds.
Roe is one of the very few food sources for Vitamin D, it's full of Omega-3...