An unusual species of fish that can walk and breathe air shows that these animals may be more capable of adapting to life on land than previously thought, researchers say.
Young corals and fish in the Pacific Ocean can smell a bad neighborhood.
Measuring 10 feet long and weighing in at more than 400 pounds, it's hard to imagine that the arapaima, the largest fish in the Amazon River basin, could ever go missing.
Though whale sharks (Rhincodon typus) are the largest fish in the ocean, they have remained quite mysterious to scientists.
Deep-diving fish have a problem: The only light that penetrates their watery environment is blue and green hardly enough of a palette for flashy color patterns.