underthevastblueseas:

Freedive record holders Eusebio and Christina Saenz de Santamaria freediving with a pod of over 60 incredible Hawaiian Spinner Dolphins

video source

professorfangirl:

mutha fuckin GOBLIN SHARK.

professorfangirl:

mutha fuckin GOBLIN SHARK.

epistemologicalfallacy:

10 More Cool Sharks You Probably Don’t Hear Much About During Shark Week

So I know that Shark Week is over now, but I couldn’t just stop at 10, so here are 10 more!

Angel Shark (Squatina)
There are 23 different species of angel shark and all live in shallow, warm seas, though some migrate to warmer waters during the summer. Most types grow to a length of 5 ft (1.5 m). They hunt at night in their own territories. Unlike rays, they have sharp teeth for feeding on shelled prey and small fish. They disguise themselves from prey by covering their bodies in sand and often having sandy-colored skin. An angel shark is hard to see as it lies on the seabed. Its body is so flat that it appears no more than a low mound in the sand. Unlike a ray, it uses its tail rather than its large fins to swim. Read more about this shark

Australian Ghost Shark (Elephant Shark) (Callorhinchus milii)
A chimaera; their length is 2 to 4 ft (60 to 120 cm). Males of the species mature at about 2.13 ft (65 cm). The club-like projection on the snout of the ghost shark is used to search for prey. The end is covered in pores that sense movement and weak electrical fields. Ghost sharks feed primarily on shellfish and molluscs. Recently, the ghost shark was proposed as a model cartilaginous fish genome because of its relatively small genome size. The genome of the ghost shark is estimated to be 910 Mb long (Mb = megabases = 1 million basepairs) which is the smallest among all the cartilaginous fishes. Recently, an Elephant Shark Genome Project has been launched to sequence the whole genome of the elephant shark. Read more about this shark

Blue Shark (Prionace glauca)
A requiem shark; the largest blue shark on record measured 12.6 ft (3.83 m) in length, but they are rumored to get as large as 20 ft (6.09 m). Blue sharks are the great travelers of the world, covering huge distances each year. They do not dive deeply for food, but hunt almost any kind of surface-living fish. They particularly like whale meat and are known to gather in “feeding frenzies” when they find a whale carcass. Blue sharks often school segregated by sex and size, and this behavior has led to their nickname “wolves of the sea”. Read more about this shark

Goblin Shark (Mitsukurina owstoni)
Grows to about 13 ft (4 m) in length. The goblin shark was first discovered off the coast of Japan over 100 years ago, yet little is known about it. Goblin sharks live in water between 330-2,300 ft (100-700 m) deep. They have sensory pores on their long snout which detect prey and their flabby body suggests an inactive lifestyle. Also known as the elfin shark. Sometimes called a “living fossil” as it is the only extant representative of the family Mitsukurinidae, a lineage some 125 million years old. Read more about this shark

Porbeagle (Lamna nasus)
A mackerel shark; reaches a maximum total length of about 12 ft (3.66 m). Porbeagle sharks prefer more temperate seas and may be seen near the British and North American coasts in summer. They are heavily built and partly warm-blooded, being able to keep their body temperature several degrees higher than surroundings. Read more about this shark

Puffadder Shyshark (Haploblepharus edwardsii)
A catshark; typically reaches 2 ft (60 cm) in length. When threatened, the puffadder shyshark (and other members of its genus) curls into a circle with its tail covering its eyes, giving rise to the local names “shyshark” and “doughnut”. It is a predator that feeds mainly on crustaceans, polychaete worms, and small bony fishes. Read more about this shark

Pyjama Shark (Poroderma africanum)
A catshark; it grows up to 3.6 ft (1.1 m) long. This abundant, bottom-dwelling species can be found from the intertidal zone to a depth of around 330 ft (100 m), particularly over rocky reefs and kelp beds. When threatened, it curls into a circle with its tail covering its head. The primarily nocturnal pyjama shark spends most of the day lying motionless, hidden in a cave or crevice among vegetation. It often forms groups, particularly during summer. Also known as the striped catshark. Read more about this shark

Sawshark (Pliotrema and Pristiophorus)
There are 7 species of sawshark; they can range up to 5.6 ft (1.7 m) in length. Sawsharks stir up the seabed with their long, toothed snout, feeling for small fish and crabs with their barbels. Baby sawsharks’ teeth are covered with skin up to the time they are born, so they don’t injure their mother or one another. Read more about this shark

Velvet Belly lanternshark (Etmopterus spinax)
A dogfish; generally no more than 18 in (45 cm) long. Lives in deep water. The velvet belly is so named because its black underside is abruptly distinct from the brown coloration on the rest of its body. Like other lanternsharks, the velvet belly is bioluminescent, with light-emitting photophores forming a species-specific pattern over its flanks and abdomen. These photophores are thought to function in counter-illumination, which camouflages the shark against predators. They may also play a role in social interactions. Read more about this shark

Zebra Shark (Stegostoma fasciatum)
A carpet shark; attains a length of 8.2 ft (2.5 m). Its long tail accounts for half its length. The zebra shark is named after the stripes that break up its shape as it lies in shallow water. The stripes make it difficult to see in shallow water. The stripes become less vivid as the shark ages. Read more about this shark

[Sources used: Wikipedia, http://www.flmnh.ufl.edu/fish/Education/bioprofile.htmand Pope, J. (1997). Sharks. New York, N.Y.: DK Pub..]

epistemologicalfallacy:

10 Cool Sharks You Probably Don’t Hear Much About During Shark Week

Since Discovery Channel’s “Shark Week” is anything but educational now, I wanted to end the week with a post that actually contains information about some less frequently mentioned sharks.

Cookiecutter Shark (Isistius brasiliensis)
A dogfish shark; only 20 in (50 cm) long, yet they have the largest teeth, compared with their size, of any living shark. They feed by gouging round plugs of flesh from their victims. Read more about this shark

Dwarf Shark (Etmopterus perryi)
A dogfish shark; only around 6 in (15 cm) long. The smallest known living shark. It lives in deep water, in the Pacific Ocean. It seems likely that it makes vertical migrations, as it has also been caught in shallow seas. Like many deep-sea fish, it has light organs on its underside. It is protected by a spine on its first dorsal fin. Read more about this shark

Gray Reef Shark (Carcharhinus amblyrhynchos)
A requiem shark; measures 8 ft (2.5 m) in length. Divers may encounter gray reef sharks since they are often found in lagoons and on the outer edges of reefs. They are not usually dangerous, but may be territorial. If it feels threatened, a gray reef shark will warn intruders by arching its back into an aggressive posture. Read more about this shark

Greenland Shark (Somniosus microcephalus)
A sleeper shark. One of the largest living species of shark, of dimensions comparable to those of the Great White; grow to 21 ft (6.4 m) long, and possibly up to 24 ft (7.3 m) long, but most Greenland sharks observed have been around 8-16 ft (2.44-4.8 m) long. Greenland sharks are sometimes called “sleepers” because they are sluggish sharks. They live in cold, northern waters — under the ice during winters. They eat carrion, and large numbers may gather to gorge on a whale carcass. One has been found with a reindeer and a polar bear jaw in its stomach. Read more about this shark

Horn Shark (Heterodontus francisci)
A bullhead shark; maximum total length is 4 ft (122 cm), with most adults reaching lengths of 3.2 ft (97 cm). The horn shark rests during the day, often in groups of several individuals. It hunts at night, using its sense of smell to find food. Though not closely related to the extinct Hybodus, it has large spines on the leading edge of its dorsal fins. Read more about this shark

Leopard Shark (Triakis semifasciataI)
A houndshark; grows to about 5 ft (1.5 m) in length. The leopard shark gets its name from its golden, blotched skin. Like some other carpet sharks, it has a flexible body that allows it to turn around in small spaces. It feeds mainly on clams, using its flat-topped teeth. Most of its time is spent cruising on the seabed, searching for food. Read more about this shark

Starry Smoothhound (Mustelus asterias)
A houndshark; reaches a length of up to 4.59 ft (1.4 m). Starry smoothhounds are sluggish sharks that live in shallow seas in many parts of the world. They are so named because of the small, white spots that break the dark shade of their sides and back. One species that lives off the US coast is able to change its color from gray to pearly white, taking about two days to complete the transition. They have large pectoral fins and feed on bottom-living invertebrates. Females give birth to up to 40 pups at a time. Some species emit an unpleasant smell. Read more about this shark

Swell Shark (Cephaloscyllium ventriosum)
A catshark; the maximum reported length of the swell shark is 43 inches (110 cm) total length. However, this species is more commonly observed at lengths of approximately 35 inches (90 cm). The swell shark is nocturnal. It rests in crevices or among giant kelp during the day. If disturbed, it swallows water or air, and swells out its body to about twice its size. This makes it almost impossible to pull from its hiding place. Groups sometimes rest lying on top of one another. Read more about this shark

Common Thresher Shark (Alopias vulpinus)
A lamniform shark; can grow up to 20 ft (6 m) long. The upper lobe of its tail may make up half of the body length. The common thresher is a surface swimmer, hunting small fish such as herring or sardines. Common thresher pups may be 5 ft (1.5 m) long at birth. They are thought to work in pairs, lashing their tails to frighten groups of fish into a tight pack that can be caught easily. Threshers are sought after by game fisherman, as they are exciting prey. However, they can inflict severe injuries with their powerful tails. Read more about this shark

Tasseled Wobbegong (Eucrossorhinus dasypogon)
A carpet shark; The maximum size of the tasselled wobbegong is believed to be 4 feet (1.25 m) total length. Wobbegongs lie half buried in the sand, camouflaged by their speckled colors. Their front teeth are sharp and daggerlike. If food is scarce, these sharks are able to clamber out of the water and cross a reef, from one rock pool to another. Read more about this shark

[Sources used: http://www.flmnh.ufl.edu/fish/Education/bioprofile.htm and Pope, J. (1997). Sharks. New York, N.Y.: DK Pub..]

lifeunderthewaves:

Grace Under The Waves by SeanDaveyPhoto Two Hawaiian sea turtles gracefully cruising underneath crashing waves, on the north shore of Oahu.

lifeunderthewaves:

Grace Under The Waves by SeanDaveyPhoto Two Hawaiian sea turtles gracefully cruising underneath crashing waves, on the north shore of Oahu.

(via scuba-div3r)

lifeunderthewaves:

Méduses by jalilarfaoui

lifeunderthewaves:

Méduses by jalilarfaoui

tiidesss:

kuas.. so fucking clear

tiidesss:

kuas.. so fucking clear

(via p4cifc)