👉 Thunnus is a genus of about 30 species of fish in the order Cichlidae. These are marine freshwater fishes, and they are known for their brightly colored fins that resemble the trunks of thorns, which are often used as weapon-like objects to catch prey. They are also known for their ability to mimic human speech patterns, such as "thunnus" in a conversation with a listener who speaks in the same dialect.