What is this 40 cm long greenish and golden shining fish with brown fins?
I caught this fish yesterday in St. John river in Canada. My father and I don't know what it is.
Fish like this have been caught recently (this Summer). Apparently, the fish was caught using worms.
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It appears to be a smallmouth bass based on this MN DNR link.
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Adding to @acpilot's answer, it appears New Brunswick, while not part of the native range of the smallmouth bass, is part of the expanded range of the fish. That further leads to a possible confirmation of the species. Here is the native and expanded range of the species in the United States according to the US Geological Survey:
This map doesn't show the expanded range into Canada, but this paper from the Canadian Manuscript Report of Fisheries and Aquatic Sciences describes the species in Canada:
T.G. Brown, B. Runciman, S. Pollard, A.D.A. Grant, and M.J. Bradford: "Biological Synopsis of Smallmouth Bass (Micropterus dolomieu)" [2009] Canadian Manuscript Report of Fisheries and Aquatic Sciences
Specifically, the authors include this map of the native and expanded ranges of the species in section 2 of their paper, "Distribution", which shows the species in New Brunswick:
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