You won’t need a water heater to keep these hardy and colourful tropical fish happy and healthy. From garden ponds filled with Koi Carp to the humble goldfish bowl (although goldfish are far happier ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. Cold-water fish are losing their habitats in temperate lakes due to a ...

When water temperatures get too hot, fish can become stressed or even die. In rivers, Atlantic salmon and other cold-water species sometimes escape the heat by flocking to cooler areas, which often ...

Tuesday is National Go Fishing Day, but Maine biologists are encouraging people to leave the cold-water species in their safe zone during the heatwave and seek warm water fish such as bass, perch or ...

In the light of the setting sun, the water lapping against the rocky shore glistened like freshly spilt ink. Despite the fact that it is frigid to the touch, this cold environment is home to a wide ...

Endangered cold water fish are appearing leaps and bounds ahead of where they were in the past five decades thanks to efforts by one Northern California region to restart local salmon runs. From the ...