Kevin the Black Bullheads and others along with largemouth bass have caused the decline and extirpation of many chubs and pupfish out west....Im not sure where you got your info. but this is from the USFWS.
Means of Introduction: Intentionally stocked for sport and as a food fish. In Idaho, it was probably accidentally stocked with brown bullhead
A. nebulosus or with channel catfish
Ictalurus punctatus (Linder 1963).
Status: Established in most locations where introduced. Apparently not established in Connecticut (Whitworth 1996). A single report from Massachusetts in the 1940s (Hartel 1992).
Impact of Introduction: Introduced black bullhead eat endangered humpback chubs
Gila cypha in the Little Colorado River, and may exert a major negative effect on the population there (Marsh and Douglas 1997). Minckley (1973) reported that this species is generally considered a pest in Arizona as it forms large stunted populations that compete with more desirable fishes for space and food. Black bullheads are voracious predators of newly hatched gamefish (Whitmore 1997). Introduced predatory fishes, including the black bullhead, are likely at least partially responsible for the decline of the Chiricahua leopard frog
Rana chiricahuensis in southeastern Arizona (Rosen et al. 1995).
Remarks: Although the black bullhead has not been reported from South Carolina, it is probable that it has been introduced into the state. Tyus et al. (1982) gave a distribution map of the this species in the upper Colorado basin. Occurrence in Maryland is not listed by Lee et al. (1976, 1981) or Rohde et al. (1994). Becker (1983) states that in Wisconsin the black bullhead's distribution is much more extensive now than it was in the mid-1920s, especially in northern Wisconsin.
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