Small stickleback shoals lined up and swam closer together in murky water, and the tighter fish groups reached food faster.

There are eight known species of sticklebacks (order Gasterosteiformes). These small fish live in fresh, brackish, and marine waters all over the Northern Hemisphere and as far north as the Arctic ...

A medaka cold tolerance test scored by AI agreed with trained experts, and one small Taiwanese fish lasted longer than its ...

To keep your fish healthy and happy throughout their life, you need to understand how and why to change your fish tank water. There are thousands of fish breeds, and each one requires different care ...

Since the early 1970s, water-cooled power plants have installed fish protection technologies largely on a case-by-case basis with limited guidance from the U.S. Environmental Protection Agency (EPA).

Most assume that cold water is deadly for fish. The truth is, nature has incredible exceptions. In polar oceans and snowy lakes where temperatures hover near freezing, certain fish actually thrive ...

Fish can suffocate and die from oxygen deprivation, even when surrounded by water. This occurs when dissolved oxygen levels are too low due to pollution, heat, or other environmental factors, or if ...

At three inches long, the delta smelt is one of the smallest fish in California -- but ounce for ounce, no species statewide carries more weight. Endangered since 1993, the plankton-eating silver ...

"Fish out of water" usually means someone who’s totally out of place. Some fish didn’t get the memo. For Saturday’s Weird Animal Question of the Week, Ving Salcedo asked what type of fish can live ...