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No one really knows when the English name 'Oscar' was first used for the South American cichlid Astronotus ocellatus. In Germany this fish is called Pfauenaugenbuntbarsch, meaning Peacock cichlid.

Oscar (Astronotus ocellatus) picture by Jon Helgi Jonsson, Creative Commons. The Oscar is the best-known and most common pet cichlid. Some do it intentionally, but a significant number of Oscar ...

To settle the arguments, this study reported the genome of a kleptoplastic sea slug, Plakobranchus ocellatus, and found no evidence of photosynthetic genes encoded on the nucleus. Nevertheless, it was ...