BISMARCK — North Dakota Game and Fish fisheries biologists spend a lot of time in fall surveying district lakes and the Missouri River System in North Dakota looking for natural fish reproduction, ...

Some species of fish can evolve their egg-laying habits in response to predators in the area in order to survive, according to new research. Some species of fish can evolve their egg-laying habits in ...

A new study by the Shedd Aquarium has found that the Chicago River system continues to recover from pollution, as evidenced by the fish species that have been spawning in the river system. A report on ...

Fish reproductive biology and ecology encompass a diverse range of phenomena from gametogenesis and spawning strategies to larval development and recruitment patterns. Recent studies have highlighted ...

In mosquitofish, of the genus Gambusia, male fish are smaller than females -- sometimes only half the size. Biologists had previously assumed that smaller male mosquitofish had at least some ...

Polar fish experience lower mortality than tropical fish, allowing them to delay reproduction until later in life when they are larger and can produce more eggs, according to a study by Mariana ...

Water temperature plays a vital role in the behavior and survival of fish. Being cold-blooded, fish rely on external temperatures to regulate metabolism and activity. Even small changes in temperature ...

A mussel has been captured on video flapping its mantle in an attempt to lure a fish to involuntarily serve as a host for its larvae. The short clip, which was posted online by the West Virginia ...

Ranging in size from about 2 to 6 inches, the killifish are ideal for evolutionary studies because they are highly adaptable to their surroundings. Some types of killifish are even known to be ...