In the fascinating underwater world, gender is far from fixed. Many aquatic animals can change their sex, a unique biological process known as sequential hermaphroditism. This natural adaptation ...

An international team of scientists recently led a detailed study of eastern rainbowfish, Melanotaenia splendida splendida, a freshwater species that is popular in the aquarium trade. Eastern ...

The Polish Geological Institute-National Research Institute reports a Lower Devonian (419 to 393 million years ago) fossilized trackway in the Holy Cross Mountains, Poland, attributed to dipnoan fish.

Cavefish have obvious adaptations such as missing eyes and pale colors that demonstrate how they evolved over millennia in a dark, subterranean world. Now researchers say these incredible fish have an ...

Fish transitioning from marine to freshwater habitats is a complex adaptive journey involving multiple polygenic traits. This parallel evolution of rapid freshwater adaptation, scientists note, ...

WASHINGTON (Reuters) - While people and other vertebrates are color blind in dim light, some deep-sea fish may possess keen color vision to thrive in the near total darkness of their extreme ...

Teleost fish exhibit a remarkable suite of blood‐related adaptations that underpin their ecological success in diverse aquatic environments. Unlike mammalian red cells, teleost erythrocytes retain a ...

June 11 (UPI) --Life in Antarctica requires a surprising level of genetic adaptability, according to a new study. When scientists mapped the genome of a group of Antarctic fishes called notothenioids, ...