roach 1 
(rōch)
(rōch)n. pl. roachor roach·es
1. An edible freshwater cyprinid fish (Rutilus rutilus) of northern Europe.
2. Any of various similar fishes, such as some North American freshwater sunfishes.
[Middle English roche; akin to Medieval Latin rocea (attested in a source from England from around AD 1000) and Anglo-Norman roche and ultimately of unknown origin.]