ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Dogfish egg case attached to a sea fan (red). The dogfish, or rough hound, (Scyliorhinus sp.) is a small shark that inhabits coastal waters in the northern Atlantic Ocean. Each egg case contains a single embryo, which develops into a young shark in around 9 months. The infant is around 10 centimetres long when it emerges from the case. The cases (also called mermaid's purses) are attached to structures to protect them from predators. The dogfish feeds on crustaceans and small fish. A sea fan is a colonial coral-like organism. Photographed in the French Mediterranean Sea.
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