"Carp were introduced to the US has a food fish by immigrants" They were brought in by the government, which makes them introduced vs invasive. The Silver, or Asian Carp are invasive, Snakeheads are invasive, but Common Carp (or German Carp as they were known at the time) were introduced. Lincoln was the President and had a good relationship with the German immigrants (providing them a printing press when a Democrat mob threw theirs into the river, or he might never have become President), but the introduction of the carp was likely as much due to looking ahead to the waves of immigration that were coming as for those already here. I've been fishing for carp for 30 years (out of 65 years at least of fishing), done the research, know the history, and I'm still the new guy here. If you want to see them being fished as a food source, check out Carp Killer on Tik Tok, he's one of the commercial fishermen on Lake Winnipeg that began netting for carp when the demand began. He'll take a contract for tons of carp with probably a million or so in equipment and a 4 or 5 man crew. 20 years ago when Lake Winnipeg was suffering due to aquatic plants being uprooted (and carp were blamed), proposals included poisoning the carp, erecting barriers, poisoning all the fish in the lake then restocking, but now that there's a market for them, the solution appears to be just catching them. Lake Winnipeg is an inland sea twice the size of Yorkshire or about the same size as New Jersey, for scale.