LOS ANGELES— The Center for Biological Diversity sued the Trump administration today for failing to protect Southern California’s unarmored threespine stickleback, a tiny scaleless fish known for its ...

A tiny, scaleless, freshwater fish, the highly endangered unarmored threespine stickleback is a fierce protector of its nest, which it defends by dashing forward with gaping mouth and “hackles” raised ...

Females do not always trust males who emit strong sexual signals, according to a study by evolutionary biologists. Researchers from Glasgow and Exeter universities studied mating behaviour in ...

* Description: Small, perky fish, as adults sticklebacks are typically between 6- and 10-cm long. They have 30 to 40 lateral armor plates along their sides, and also three long dorsal spines that can ...

Fish can be turned on by an aquatic equivalent of pornography, according to research revealed yesterday. Swiss scientists have discovered that male sticklebacks ejaculate more sperm if first ...