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Biotoecus opercularis
 (Steindachner, 1875)
  Family: Cichlidae (Cichlids) / Order: Perciformes (Perch types)
  
  Common names Distribution Environment Fish  
  UK: Green Dwarf Cichlid
DK: Grøn Dværgcichlide		 South America:
Rivers Amazon, Branco, Negro, Urubu & Trombetas		 Freshwater
28ºC / pH <7		 Max Size: 10 cm