Astronotus species grow to 35 cm in size, and are monomorphic. They are opportunistic omnivores and consume a range of smaller fish, fruits, nuts,  crustaceans, mollusks and other invertebrates in the wild.
The Astronotus species can grow up to 35 cm in length and exhibit no sexual dimorphism. As opportunistic omnivores, they consume a variety of smaller fish, fruits, nuts, crustaceans, mollusks, and other invertebrates found in their natural habitat.