The Midas cichlid (Cichlasoma citrinellum) is an abundant fish in the lakes of Nicaragua. Many populations are polychromatic, about 7 to 10% of the adults being variously white, yellow, orange, or red ...

Many species of fishes are aggressive when placed in small aquaria. Aggression can negatively affect the welfare of those individuals toward whom it is directed. Animals may behave aggressively in ...

Mirrors are often used to elicit aggression in animal behavioural studies, with the assumption being that creatures unable to recognize themselves will react as if encountering a rival. But research ...

Something strange is happening to the Mayan cichlids fish that are usually hardy and aggressive are now turning up dead with ...

Biologists have discovered that the cichlid fish can see in the near infrared range; this was thought to be unlikely until now. Seeing in the infrared range is apparently helping fish to hunt in ...

Even though a male cichlid is one tough fish, he may be scared of his own reflection. A new study shows that squaring off to fight a mirror opponent can be worse than fighting a real foe. Male cichlid ...

Changes in aquatic environments can affect fish behavior. Water renewal, for example, can dilute chemical signals, which are a social communication tool used by some fish species, and this dilution ...