Sorry to barge in but I'll share some info on these guys from my trip to Uruguay last winter...
We caught C. dimerus in two locations (both in areas in the Rio Uruguay watershed) - one near Bella Union called La Pedrera and the other a little south of there called Villa Constitucion.
The Rio Uruguay separates Uruguay from Argentina and is a big river. These guys were in smaller bodies of warm water with muddy bottoms and lots of vegetation.
What's interesting is that these guys seem to replace Chanchitos (Australoheros) in this area.... although further north (on the Rio Cureim, which separates Uruguay and Brazil) there are only Chanchitos and not Acaras. Bella Union and the Rio Uruguay in this area is the intersection of tropical fish and sub-tropical ones...which is really interesting...
I brought back a 3-4" male (see last photo of him cleaned up) and female from La Pedrera and some small ones (5 fit easily into a breather bag) from Constituction.
Here are some pictures:
1) The drainage pond outside of Bella Union, UR (called La Pedrera) that empties (periodically) into the Rio Uruguay. Also in this pond were pirahna, Gymnogeos (balzani, "High dorsal north"), Hoplias (wolf fish), Leporinus, Prochilodus, tetras and other fish not found in other parts of Uruguay
2) Another view of the same spot. This, as I undersand, is basically a collection of drainage from the sugar plantation in Bella Union. The water (and the air) was hot - nearly 100 degrees in spots. The bottom was really muddy as well.
3) Basically this spillway was keeping the pond from emptying into the Rio Uruguay (which it does, I'm sure, after a big rain). Pirahna and Hoplias get fat living in this pond and not having to compete against river monsters...
4) Main street Villa Constitucion, Uruguay. We ate lunch at the town's restaurant, which was quite good!
5) The first collecting site (basically at the end of the road) in Constitucion. The dimerus here are a very nice blue color (more-so than the greener ones from La Pedrera). Ken (Davis) caught some huge pikes here as well.
6) Second collecting site in Constituction was shallower and more vegetated. This is where we caught the little ones I brought back. We also caught a serpae tetra here!
7) and 8) Pictures of La Pedrera dimerus in Felipe's holding tanks (photos by Scott Arney)
9) Photo of my wild male dimerus unhappy in his show tank at the ACA. He won 2nd in the class (Dan Ye-Jennings, of course, won first

)... Photo by Mo Devlin (obviously)
Matt
