A handful of videos on YouTube and TikTok have been racking up likes by showing a strange line in the ocean, with dark water on one side and light water on the other. Lines like this often appear ...

At first glance, the meeting point of the Pacific and Atlantic Oceans looks like a dramatic clash between two separate bodies of water. The difference in water color, often observed in places like ...

The largest high-tech tag study yet of Atlantic bluefin tuna suggests that two groups mix on feeding grounds but spawn on opposite sides of the ocean. This finding indicates that fishing regulations ...