In the “twilight zone” of the deep ocean, strange glowing sharks have evolved eyes that are adapted to see complex patterns of light in the dark, new research reveals.
These bioluminescent sharks have a higher density of light-sensitive cells in their retinas, and some species have even developed other visual adaptations that help them see the glimmering lights they use to signal to each other, find prey and camouflage themselves in this region where little light penetrates, according to a study published today (Aug. 6) in the journalPLOS ONE.
This is probably the closest you will ever get from a Great White shark bite without being injured or losing a limb.
In 2013, a team from the Woods Hole Oceanographic Institution took a specially equipped REMUS “SharkCam” underwater vehicle to Guadalupe Island in Mexico to film great white sharks in the wild. They captured more than they hoped for. This incredible footage is set to air on this year’s Shark Week.
REMUS stands for Remote Environmental Monitoring Unit.The pre-programmed SharkCam is controlled by scientists, and features 6 GoPro video cameras, providing a spectacular 360 degrees view of the surroundings. These cameras were mounted on underwater probe REMUS-100. It can go as deep as 100 meters or 328 feet and can stay underwater for a maximum of eight hours.
REMUS doesn’t intrude with the routines or behavior of marine animals. However, it was getting noticed by a bunch of sharks, stalked, and sometimes bitten from underneath. The SharkCam was fortunate enough to have survived the series of shark attacks and brought home recordings for scientific studies—along with the shark bite marks on it.
The sawfish uses its long, toothed rostrum not for killing, but for immobilizing. Also known as the carpenter shark, its nose is covered in electrosensitive pores that detect small movements in the water. When it detects food nearby, the shark slashes its nose through the water to stun prey long enough to gobble it up.
The basking shark, Cetorhinus maximus, is the largest shark species normally found in British waters, growing up to 6-8m in length. It’s also the second largest shark in the world, beaten only by the Whale Shark (12.65m in length maximum recorded).
Despite being one of the biggest fish in the sea, this species feeds solely on plankton and does not actively hunt larger prey. A gentle giant!