Under Water Amazing World

sea slug

two gorgeously colored sea slugs are mating.....(Source)

Blue Ringed Octopus:

One of the tiniest, cutest cephalopods on earth is also the last octopus you ever want to encounter. When frightened or threatened, the blue ringed octopus – which measures just a few centimeters in size – brightens its blue rings and proffers a painless warning bite. You skip away, thinking you’re fine…until you’re seized with paralysis and death in short order. The blue ringed octopus, which graciously inhabits tide pools and shallow tropical waters, actually possesses a neurotoxic venom that is more violent than any land creature on earth. Good times!!!(image Source)

Cone Snail:

The cone snail or cone shell looks like an innocuous, pretty sea shell. But the cone snail, along with its 400 genetic cousins, can inject you with a painful dose of venom through its harpoon, as many a tourist has learned the hard way. Conveniently, salt water makes the pain even more excruciating, and paralysis often results. Soon after, respiration is no longer possible. This means you die.

Mimic Octopus

The Indonesian Mimic Octopus has a unique ability to turn virtually any color or pattern. It is naturally brown and spotted but has been seen in every hue from ghost white, as shown above, to brilliant blue and fiery red or mysterious pink. Though many octopi are known to change color and skin texture, only the Mimic Octopus can take on the shape and features of other animals and surroundings.

Turritopsis nutricula:

The only immortal creature on earth.. . Turritopsis nutricula,a saltwater animal related 2 jellyfish. like other jelyfish,it undergoes 2 distinct stages in life cycle.the polypoid(immature)nd medusa(mature) a jelyfish lifespan usually ranges a few hours 2 several month,rarely year 4 bigger species.bt this one manages 2 beat the system it is able 2 transform between medusa nd polypoid stage.therby reverting back 4m mature 2 immature stage nd escaping death.the cell process is called transdifferentiation.

Sea anemone:

sea anemone ♥ stunning colors

Blue jellyfish:

Beauty of ocean-life, Blue jellyfish

Blanket octopus:

A unique, marvelles looking sea creature. As it's not very big, it's easy prey for others. So it uses a different way..when threatened they realise a silly blanket like membrem from its arms and spreay them..which makes it appear much bigger.also uses to catch pray.cover corals with blanket to find hidden fishes...

Portuguese man o' war:

Portuguese man o' war may look like a jelly fish, but actually it belongs to a different group called siphonophores, which are colonial Cnidarians. The name comes from the Man-of-War, a 16th-century armed sailing ship, and the cnidarian's supposed resemblance to the Portuguese version at full sail. They have a brightly coloured (mostly blue) float which helps them to be blown along the wind on warmer seas. Don’t fall for those bright colours and a helpless appearance. The tentacles are armed with venom-filled nematocysts. Stings usually cause severe pain to humans, leaving whip-like, red welts on the skin that normally last 2 or 3 days after the initial sting. There can also be serious effects, including fever, shock, and interference with heart and lung function. Stings may also cause death, though rarely. These creatures are responsible for up to 10,000 human stings in Australia each summer. Interestingly, the blanket octopus is immune to the venom of the Portuguese man o' war and has been known to rip off the man o' war's tentacles and use them for defensive purposes.

Colossal Squid:

This Mollusc is the largest known invertebrate ever recorded, growing up to 46 ft in length. It has hooks at the tips of its arms and tentacles. It is also known as the Antarctic Squid because it is mostly found in the Antarctic Ocean. It is still a great mystery how this animal achieves such a huge size despite eating only 30 g of food daily. In 1925, the very first specimen was discovered in the form of two tentacles found in the stomach of a sperm whale. It was initially estimated to measure 33 ft in length and weigh 450 kg!! The largest recorded specimen was captured by a New Zealand fishing boat off Antarctica in 2007. Colossal squids have large pupils and retinas. This allows more light into the eye. Despite their huge size and the sharp claws on their tentacles, life isn’t easy being a colossal squid. They’re food for sperm whales, which can grow to 67 feet long. This gigantic nature is very common in deep sea, a phenomenon known as "abyssal gigantism".

Sea Urchin:

Urchin is an old name for hedgehogs. So Sea urchins are the hedgehogs of the sea. Sea urchin is an Echinoderm and lives on the sea bed to a depth of 5000m. Its globe-shaped body has very long movable spines. Some species walk on their spines while others use their tube feet for locomotion. Contact with the spines is quite painful. However, relatively few species are venomous. Ancient philosopher Aristotle discovered a masticatory apparatus, to which five teeth are attached inside the mouth. It is called Aristotle’s lantern. The gonads of both male and female sea urchins are taken as a delicacy in Mediterranean countries, Japan, New Zealand and West Indies. It is usually called sea urchin roe or corals. One interesting fact about their life is that they are sessile at birth that means they are fixed to a substrate at juvenile stage of their life.

Lion's mane jellyfish:

The Lions Mane Jellyfish is the largest jellyfish in the world. It is mostly found in cold waters of Arctic, northern Atlantic, and northern Pacific Oceans. It is among some of the oldest surviving species in the world. The largest recorded specimen found had a bell (body) with a diameter of 7 feet 6 inches (2.29 m) and tentacles 120 feet (37 m) long. They have hundreds of poisonous tentacles that it used to catch passing by fish. It then slowly drags in its prey and eats it. Stings usually causes pain and localized redness in human, not fatal though. If you are beaten by one of these, wash the stung area with vinegar, isopropyl alcohol, or meat tenderizer.

Corals:

Corals are marine, colonial cnidarians. They live in a horny skeleton made of their own secretion. A coral "head" is the familiar visual form often confused as a single organism. While it is actually a group of many individual, yet genetically identical, multicellular organisms known as polyps. The polyps interconnect by a complex and well-developed system of gastrovascular canals, allowing significant sharing of nutrients and symbiotes. Corals can catch small fish and plankton, using stinging cells on their tentacles, most corals obtain the majority of their energy and nutrients from photosynthetic unicellular algae called zooxanthellae that live within the coral's tissue. Corals can be major contributors to the physical structure of the coral reefs that develop in tropical and subtropical waters, such as the enormous Great Barrier Reef off the coast of Queensland, Australia. Other corals do not have associated algae and can live in much deeper water, with the cold-water genus Lophelia surviving as deep as 9,800 ft. It is a fact of concern that about 60% of the world's reefs are at risk due to human-related activities.