The huge red jellyfish, the gigantic isopod, the giant ostracod, the enormous sea spider, the giant amphipod, the Japanese spider crab, the giant oarfish, the deepwater stingray, the seven-arm octopus, and a variety of squid species, including the colossal squid (up to 14 m in length), the giant squid... yes, all these creatures are left in awe by humans.
In fact, there are several creatures that fall under the category of "giant marine organism". They differ in size from the jellyfish, which can be as small as a pinhead but most commonly range from about 1 to 10 feet (30 cm to 30 m). Isopods are much larger at about the size of a hand or foot, while arthropods comprise most of the remaining organisms listed here - including spiders and crabs. The largest living arthropod is the saltwater crocodile, which can grow to a length of 13 feet (4 m).
All of these creatures possess something in common - they are soft bodied, which means they aren't covered in bone or hard parts like an oyster or a lobster. This makes them susceptible to becoming food for large predators - especially when they cluster together in large groups like whales do with their prey. Indeed, some researchers believe that whales evolved this habit so they could more easily digest the animals within their mouth.
Deep-sea huuuuuuuuuuuuuuuuuuuu Deep-sea gigantism, also known as abyssal gigantism, is the propensity of invertebrates and other deep-sea dwelling organisms to be bigger than their shallower-water cousins in zoology. Proposed theories include adaptation to scarcity of food, increased pressure, or lower temperatures at deep. No single theory can explain all cases of deep-sea gigantism.
The majority of documented examples of deep-sea gigantism involve mollusks (gastropods and bivalves). Some species of giant snail from the family Mytilidae can reach a shell diameter of over 20 inches (50 cm), making them among the largest mollusks in the world. Other large mollusks that have been found living on or in the floor of the ocean depths include octopuses, squid, cuttlefish, and chiton shells.
Some marine creatures that aren't necessarily larger but have different features when compared to their shallow-water counterparts include dolphins, whales, ichthyosaurs, and plesiosaurs. These animals live in the deepest parts of the oceans where the pressure is very high, so they need to adapt to this new environment by developing ways to protect their brains and bodies against it. Dolphin brains, for example, are about one-tenth the size of their terrestrial counterparts because more energy is needed to drive such a large heart and blood system.
Under these severe conditions, terrifying organisms like as kraken-like huge squid, chitinous giant isopods, and jellyfish a meter in diameter have thrived. One adaptation that has helped them survive is gigantism, which is frequent in the deep seas and freezing waters of the poles. Giant species are often defined by their weight: whales that weigh more than 100 tons are considered giants.
Giant deep-sea creatures have been reported from all over the world, but they are most common in polar regions. The largest known creature on record was a whale found off Antarctica that weighed 150 tonnes (330,000 pounds). Other massive animals have been estimated to weigh more than 100 tonnes (220,000 pounds).
These monsters are usually defined by their size; however, some species contain extremely large individuals. For example, blue whales can reach up to 120 feet in length and weigh in at around 200 tons. The largest known isopod, a crustacean similar to shrimp, grows almost 30 inches long and weighs about 1 pound. Jellyfish can grow larger than 12 feet in diameter and weigh hundreds of pounds.
The ocean's deepest point is located in the Mariana Trench in Guam. It measures 9,520 feet deep from surface to bottom. At this depth, temperatures vary between 0 and 48 degrees Fahrenheit and pressure increases to 10 million pounds per square inch.
It can grow to enormous proportions, exemplifying deep-sea gigantism: recent estimates place the maximum size at around 12–13 m (39–43 ft) for females and 10 m (33 ft) for males, measured from the posterior fins to the tip of the two long tentacles longer than the colossal squid, which grows to an estimated 9–10 m (30–33 ft), but including the tentacle tips. Other massive squids reach 7 m (23 ft) or more in diameter.
How do giant squids die? When they are old, usually. A few have been found with scars on their bodies that indicate they were once part of a fishing crew; perhaps not liking what they were being used for, they killed themselves by diving into shallow waters where they could no longer pull up fish prey.
Giant squid are thought to be mature when they reach about 6 m (20 ft) in length. They continue growing until about 10 years old, when they stop reproducing and start eating again. This may be because they cannot find enough food otherwise; also, it takes a lot of energy to grow bigger than you need to be.
There are only five known species of giant squid, so researchers don't know much about how they behave or what kills them. However, since most giant squids are older than 10 years, they must eat every few years to remain active. It's possible that they hunt down smaller squids or even krill for food, but this has never been observed directly.
The phrase "deep sea creature" refers to creatures that reside beneath the ocean's photic zone. These species must survive under difficult environments such as hundreds of bars of pressure, low oxygen levels, limited food, no sunshine, and persistent, extreme cold. The deep sea is divided into three main zones based on depth: mesopelagic (between 200 and 1000 meters), bathypelagic (more than 1000 meters), and abyssal (below 6000 meters).
Sea creatures come in many different shapes and sizes. Some are very small, while others are quite large. Regardless of their size, they all have similar features. All sea creatures have skin and muscles, although some may have these parts in more or less proportion to each other. They all have organs for breathing, eating, sleeping, mating, and releasing eggs/spawn. And most have sensory organs used for sensing their environment. Meso- and macro-fauna include fish, squid, octopus, lobsters, crabs, nautiluses, ammonites, belemnites, etc.
Sea creatures belong to several different taxa, or groups. For example, fish are a class of aquatic animals with gills and spinal cords, while cephalopods are mollusks with brains composed of numerous tissues cells connected by nerve fibers.
It is still one of fiction's most popular sea monsters, having appeared in films such as Pirates of the Caribbean, Clash of the Titans, and Game of Thrones. While science has abandoned the concept of a mile-long monster hiding at the ocean's depths, it has unearthed a fantastic, Kraken-like creature: the giant squid.
These enormous cephalopods are the largest animals that have ever lived on Earth. They can grow to 20 feet (6 m) long and weigh up to 11,000 pounds (5,000 kg), making them larger than all but the biggest whales. And like other squid, they contain within their armsada tissue composed of flexible fibers called "neurons" that transmit electrical signals between the animal's brain and its muscles. Although we know very little about how they communicate, scientists think that giant squid may use electricity to send messages through their armadas.
Scientists have discovered several fossils that were once considered to be giant squids, but which later turned out to be large lobsters or sharks. One such find was made in Japan in 1603. The fossil was studied by Japanese scientist Tokugawa Ienari, who named it Maior for its huge size. Modern scientists believe that this specimen is not a single species, but rather a group of closely related creatures that grew larger over time. There are also reports of giant squids being caught in fishing nets, but almost always after they have been torn open by larger fish.