02-07-2014, 09:47 PM
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Originally Posted by Sylverclaws
@jaysee there are two types of "Emerald" cories, one stays around 2 1/2-3 1/2 inches, the other can actually get 4-6 inches. Six inches I hear is EXTREMELY rare even for the big guys, however I had one of four that did. lol I ended up getting a mix on accident once, I wondered how I got these behemoths with my little guys, they look almost identical except the bigger ones are usually darker in color, and bigger obviously...and the smaller type(I can't remember the scientific names) are usually a shiny green(though not always, but this is how I told the youngsters apart, the larger ones also tend to have bigger heads and slightly different noses than the smaller types).
They are easily differentiated at any age by the dorsal fin. The brochiis splendins which are the "emerald cory" (only one kind) have 13 dorsal rays - their dorsal fin extends almost all the way to the adipose fin. Corydoras anaeus, the broze cory (can be mislabeled as emerald, but that's an error not a different kind), as well as other corys, have only 7 dorsal rays (half the size). There is a large gap between the dorsal and adipose fins.