Evolutionary biologists describe a new gene in the Central American Midas cichlid fish and identify a variant caused by a 'jumping gene' (transposon). This variant of the 'goldentouch gene' is most ...

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 ...

1. Cichlasoma citrinellum is a cichlid fish found in the Great Lakes and crater lakes of Nicaragua. It is sympatric with C. zaliosum in Lake Apoyo, a Nicaraguan crater lake. C. zaliosum is confined to ...

The mechanisms by which new species arise are still not fully understood. What are the evolutionary processes that drive the evolution of new species? Evolutionary biologists traditionally assumed ...

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 ...

Cichlid fishes are one of the best model system for the study of evolution of the species. Inspired by them, in this paper we simulated the splitting of a single species into two separate ones via ...

Your fish are probably pissed off if you keep them in a small aquarium, suggests a study published this month in the Journal of Applied Animal Welfare Science that looked at levels of aggression in ...

Lake Sampaloc in the Philippines is experiencing something of a gold rush because of an invasive species. The sight of golden-specked cichlids is increasingly common in the water after the fish — ...

Sometimes individuals of the same species differ greatly in their shape or colouration. Scientifically, this phenomenon is referred to as "polymorphism". The 13 fish species that belong to the Central ...

Evolutionary biologists have analyzed the role of microRNAs in the evolution of new species. The mechanisms by which new species arise are still not fully understood. What are the evolutionary ...