I thought we were over that sort of nonsense. Some of the more southerly pikeminnows were nearly destroyed due to elimination campaigns to protect trout from these "trash fish". Similar efforts have been conducted in the east against gar and bowfin. Their impacts on game fish are understudied and almost certainly overstated.
1st of all it was habitat destruction which wiped out most of the Colorado Pikeminnow (breeding areas)"The Colorado pikeminnow, P. lucius, is the largest member of the genus, averaging 4 to 9 pounds (2 to 4 kg) in adult fish with occasional specimens up to 25 pounds (11 kg). There are historical and anecdotal reports of Colorado pikeminnows nearing 6 feet (1.8 m) in length and 80 pounds (36 kg) in weight. The species is near extinction in its native Colorado River basin habitat, due to extensive habitat destruction." Wikipedia.
2nd of all the Northern Pikeminnow is such a threat to Salmon stocks because young Salmon colect at Damns I meant Dams and then get corralled and herded into areas that they cant escape where Pikeminnow gobble them up like sharks! These dams are not natural and enable the Pikeminnow to almost wipeout Salmon stocks in some areas." A mature female can lay 30,000 eggs annually. Pikeminnow are voracious predators, and in the Columbia River and Snake River salmon smolts comprise a large part of their diet. Their population has flourished with the development of the Columbia River Hydro-power System. The reservoirs have provided excellent habitat for pikeminnow and given them an advantage over depressed salmon and steelhead populations." Wikipedia. I agree with your assessment on Bowfin and gar.....but the subject is CARP, whose high fecundity and omnivorous nature (they especially like eggs) makes them a natural high risk threat to many of our native fish.