11-05-2011, 08:02 PM
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Assuming this fish is correctly identified as Parotocinclus jumbo, then it should be in a group. This species occurs in several rivers in SE Brazil, including the Rio Paraiba where the type specimens were captured. It is always found in large groups. If you do a search you will find several aquarists commenting on their shoaling (or schooling) behaviours.
Britski and Garavello, who described and named this species in 2002, are of the view that this species should likely be reclassified into another (new) genus. Still, that doesn't bear on the fact that it is a shoaling fish.
With no disrespect to Bob Fenner, the author of that article (which I read, and I agree TFH is a worthy periodical), it is rather difficult for any of us to know whether or not a fish is fine on its own. Sometimes one can detect clear indications of stress, and sometimes not. If the fish has evolved over thousands of years to live in a group and is always found as such in its habitat, one would be wiser to assume that is the best way to keep it healthy.
On a side note, the fish pictured in the photo labelled Corydoras adolfoi is not that species, it is Corydoras duplicareus.
Last edited by Byron; 11-06-2011 at 01:28 PM..
Reason: correct spelling of species