In the Atlantic slope drainages in the northeast, there are very few native large predatory fish (chain pickerel, redbreast sunfish, pumpkinseed, brook trout, and white/yellow perch) and all bass and most trout are introduced. Especially in rivers where I typically snorkel and fish, the sort of niche currently filled by smallmouth bass (introduced in the late 1800s) doesn't have a native equivalent. Is there any body of evidence on native fish (cyprinids, lepomids mainly) that dates back that early? I would think that species such as redbreast sunfish would not be able to fill the niche of piscivorous, fast water fish, so an increase in predation of native cyprinids in that habitat must have occurred. Are there any more modern examples (Midwest or west maybe?) of what sort of impact introduction of large predatory fish has? I know of introduced trout in New Zealand impacting native galaxias, but I'm not familiar with anything similar in North America.
Edited by LepomisAuritus, 16 January 2019 - 08:51 PM.