Kitefin sharks (
Most marine organisms that produce bioluminescence contain special chemicals, including a compound called luciferin that interacts with oxygen to produce light. But these three sharks do not appear to contain the same chemical properties, so their ability to emit light “remains enigmatic,” the researchers say.
The researchers suggest the sharks' glowing underbellies may help them hide from predators or other threats beneath them. They say the bioluminescence is achieved through thousands of photophores (light-producing cells) located within the sharks' skin.
Scientists have discovered three species of glowing sharks in the deep ocean near New Zealand, reports Elle Hunt for the Guardian. One of the species, the kitefin shark, can reach lengths of nearly six feet and researchers say its cool blue glow makes it the largest known species of luminous vertebrate on Earth.
The scientists think that the greenish-blue glow, which is concentrated around the bellies and undersides, helps the sharks blend in with the bluish light from above, providing the perfect camouflage. They speculate that it probably helps the tiny lantern sharks from being detected by predators.
Discovered in the deep: the extraordinary sawshark with a weapon-like snout. Swimming through the ocean are sharks that look as if they have a hedge trimmer fixed to their heads and a dangling moustache part way along it. These are sawsharks and they use their formidable headgear to slash through shoals of fish.
One of the species, the kitefin shark, grows to a length of nearly six feet, making it the largest known bioluminescent vertebrate. Giant squid, which get much bigger, are also known to produce light.
Cladoselache is regarded as the first "true shark". It lived 380 million years ago and it still retained a few characteristics of its fishy ancestors. It had a fish-like head, seven gills instead of five like most sharks, and its body was longer and less muscular than the sharks we see today.
'Godzilla shark': 300 million-year-old fossil discovered in New Mexico. ALBUQUERQUE, N.M. (KRQE) – A team of researchers from several institutions has named a 6.7 foot-long shark that lived 300 million years ago based on a skeleton that was found in the Manzano Mountains about 30 miles southwest of Albuquerque.
Sharks are older than trees and dinosaurs
The earliest evidence of shark fossils dates back as far as 450 million years, which means these creatures have been around at least 90 million years before trees and 190 million years before dinosaurs.
Because fish (such as sharks), birds, mammals, reptiles, and invertebrates all share similar brain structures, especially the areas that manage thinking and feeling, they can feel emotions in a similar way.
The rainbow shark (Epalzeorhynchos frenatum) is a species of Southeast Asian freshwater fish from the family Cyprinidae. It is also known as the ruby shark, red-fin shark, red-finned shark, rainbow sharkminnow, green fringelip labeo, whitefin shark and whitetail sharkminnow.
Glofish are one of the first genetically modified animals to become popular within the pet trade. These fish were developed by introducing different fluorescent proteins into the genome of the fish at the early stages of development.
Glofish Rainbow Sharks: The Glofish sharks actually enjoy the longest lifespan of all the species. They can typically live up to 8 years. Glofish rainbow sharks are available in three stunning colors: blue, purple, and orange.
Ten species tested had no color-sensing cells, while seven had only one type. Sharks may be able to smell blood from miles away, but they probably don't know how red it is: New research suggests sharks are color-blind.
The 6.7-foot shark, dubbed “Godzilla Shark,” is thought to have lived around 300 million years ago. The unknown species was given the nickname Godzilla shark or dragon shark because of its huge jaw and the sharp spines on its dorsal fins.
Godzilla is a prehistoric reptilian monster awakened and empowered by nuclear radiation. With the nuclear bombings of Hiroshima and Nagasaki and the Lucky Dragon 5 incident still fresh in the Japanese consciousness, Godzilla was conceived as a metaphor for nuclear weapons.
The biggest shark in the world
The earliest megalodon fossils (Otodus megalodon, previously known as Carcharodon or Carcharocles megalodon) date to 20 million years ago. For the next 13 million years the enormous shark dominated the oceans until becoming extinct just 3.6 million years ago.
In fact, the largest predator of all time was a shark called a Megalodon. It lived just after the dinosaurs, 23 million years ago, and only went extinct 2.6 million years ago. It could reach lengths of up to 20 metres and could weigh up to 103 metric tonnes!
Over more than two decades, 64 victims were attacked, of which 26 died. The last deadly attack occurred on 10 July 2021. The attacks were caused by the species bull shark and tiger shark.
From timber wolves to tiger sharks, most vertebrate animals have crimson blood in their veins. This hue is produced by hemoglobin, the protein that helps our blood distribute oxygen.
Fossil records suggest that at one point in history, there were more than 3,000 types of sharks and their relatives. Sharks managed to survive during extinction events when the ocean lost its oxygen – including the die off during the Cretaceous period, when many other large species were wiped out.
Bioluminescent organisms produce and radiate light. There are thousands of bioluminescent animals, including species of fishes, squid, shrimps and jellyfish. The light these creatures emit is created inside their bodies, meaning they are able to glow and glitter in complete darkness.
Aequorea jellies glow with a bioluminescent protein used in the biotechnology industry. “There's a whole netherworld of the deep sea that we don't see when we have our lights on,” says Kevin Raskoff, a scientist at California State University, Monterey Bay.