A newly developed underwater ultrasound reveals a fetal shark swimming between the two uteri of its mother.

Given the speed and efficiency of environmental (eDNA) sampling, a much larger portion of the sea can be screened, in a shorter time, for patterns of diversity.

Scientists study the development of scales in skate embryos. 

Researchers describe more than 200 species of tapeworm from a decade-long collection of tapeworms from the digestive systems of animals around the world. 

A proposal to do so would cause waste, promote less sustainable fisheries, and penalize US fishers who follow best practices.

As Hurricane Harvey approaches land, researchers wait to see if their preparations will protect their experiments.

Analysis of an ancient shark fossil provides the strongest evidence to date that modern sharks derive from a class of 400 million–year-old bony fish.

Researchers have known for decades that certain fish make use of specialized electrosensory cells, but the precise mechanism of these cells was a mystery until now. 

Scientists use 12 microsatellites to watch as one captive female swellshark produces five pups without fertilization from a male.