The number of tuna crabs migrated along the US seabed

The bright red tuna crabs crowded into each other on the seabed off California, USA, during the migration season.

Crabs fill the seabed and crawl from place to place.

Roger Uzun recorded rare images of herd of migratory tuna crab while diving in San Diego, California, yesterday reported by Story Trender. In the video, crabs fill the seabed and crawl from place to place. They join each other to move slowly and smoothly to the destination.

"Periodically, a large number of tuna crabs will settle in the deep alley off La Jolla, San Diego. They are so much that they occupy most of the living space of the animals in the area. You will see many species. In the deep water look around to find a place to set foot, " Roger said.

"About 2-3 years ago, another large crab flocked to and stayed for about two years. When they withdrew, we encountered this new herd. Under submarine changing conditions and water temperature in the area. In areas, migratory mud crab events may become frequent and last longer than in previous years , " Roger said.