Here are some interesting statistics on water stats on eight of the different rivers we collected in April in Honduras. The one thing you have to remember is that the pH and hardness of the water fluctuate a great deal in the wild. Sudden run offs from the mountainside into the river, heavy rains, flooding, etc. all can cause a sudden shift. Fish...and in paticular CA Cichlids do well in a wide range of pH range with only long term exposure to extremes causing any serious damage.
Location 1 Rio Copan – 85F, 8.5pH
Location 2 Rio Blanco (formerly listed rio Amorillo) – no data
Location 3 Rio Chuluteca (upper reaches) – 84F, 8.6pH, 590mS (conductivity), 295ppm (TDS)
Location 4 Trib Rio Danto – no data
Location 5 Rio Bonito - 84F, 6.6pH, 30mS, 14ppm
ocation 6 Rio Belaire – 83F, 8.4pH, 110mS, 54ppm
ephemeral trib to Belaire (rivulus, mollies, etc.) – 79F, 7.1pH, 1000mS, 410ppm
Location 7 Rio Jutiapa – 84F, 8.4pH
Location 8 Rio Monga – 83F, 7.4pH
Hope this helps. And just cause the info is right in front of me, here's the species caught in each location.
#1 was Rio Copan, we only got Microthalms there
#2 was Rio Blanco, Nice red tiger Motoguense, Pocieliops pluraspilus, a few Mexicana mollies
#3 was Choloteca (?sp) Anebleps, spot tail molly (with the bar tail), convicts, hogaboomrum, a roberstsoni type, cutteri, Motos and possibly loiselli and managuense
#4 was at the Hotel I believe is was Rio Danta? New Parachromis, robertsoni, Gambusia lumia, Dominator gobies, cutteri, mollies, Others I'll have to look up
#5 was the rocky river north of La Ceiba, Name?? 3 species of Gobies, white cutteri, mollies
#6 Rio Blanco Alfrao Huberi, X. mayae (swords) Rivulus irvini, cutteri, Spot tail molly, Mexicana molly, robertsoni, mexican tetras
#7 was Rio Jutiapa Cutteri, mollies
#8 Rio Monga Red point type nigrafasiatus.