A new study has found that heavy fishing may be changing pearly razorfish at the molecular level. Researchers found no major changes in the fish's DNA but discovered differences in DNA methylation, an ...

Two young coho salmon swim from freshwater to saltwater for the first time. One was born in the wild; the other was born in a hatchery and released into the same river. The wild-born salmon is more ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. Seventy percent of salmon at the fish counter grow up in underwater ...

Salmon born in captivity become domesticated in as little as one generation, a new study finds, explaining why hatchery-born fish don't do as well as wild-born ones in Oregon rivers. Researchers ...

For certain species—some fish, alligators and lizards—the temperature of their surroundings influences their gender. This is known as “temperature sex determination," and as global warming heats up ...