Female fish have a fail-safe for surprise sperm attacks
![oscillated wrasse](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/08/081516_ht_fisheggsticker_main.jpg?fit=860%2C460&ssl=1)
Female ocellated wrasse (left) lay their eggs in an algae nest, and colorful nesting males (right) quickly fertilize them. A female’s ovarian fluid can favor sperm from her chosen mate when there’s sperm competition, researchers find.
Susan Marsh-Rollo