During a tag and release, Dr. Dean Grubbs (FSU) steadies...
During a tag and release, Dr. Dean Grubbs (FSU) steadies a 480cm/15+ft bluntnose sixgill shark, Hexanchus griseus, as researchers collect tissue samples.
Source: Gulf Of Mexico Research Initiative
Big Sixgill Shark Photo Courtesy Of: Greg Amptman and Undersea...
Big Sixgill Shark
Photo Courtesy Of: Greg Amptman and Undersea Discoveries
thefadingmoonlight: and i just bought plain wooden clothes...
and i just bought plain wooden clothes pins…sadness
Very Cool!! :-D
Gulper Shark Fitted With A Microwave Tag Is Guided Back To The...
Gulper Shark Fitted With A Microwave Tag Is Guided Back To The Depths By A Research Assistant
As Part Of A Research Program Investigating Sharks Living In The Bahamas
Photo Courtesy Of Save Our Seas Foundation
A Gulper Shark Fitted With A Microwave Telemetry X-Tag As Part...
A Gulper Shark Fitted With A Microwave Telemetry X-Tag
As Part Of A Research Program Investigating Sharks Living In The Bahamas
Photo Courtesy Of Save Our Seas Foundation
underthevastblueseas: Presented by BuellWetSuits.com
Presented by BuellWetSuits.com
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underthevastblueseas: SHARK ANATOMY Sharks, along...
SHARK ANATOMY
Sharks, along with rays and chimeras, are distinguished from other fish primarily by their body composition. Most other fish have skeletons made of bone, just like mammals, reptiles, amphibians and birds. Sharks and rays, on the other hand, have skeletons made entirely of cartilage, the same flexible material in your nose and ears. Cartilage is sturdy like bone, but it has a much lower density. This material keeps sharks relatively lightweight, so they don't sink in the ocean and they don't need an air bladder like other fish.
Sharks also have a very unique skin texture. They don't have the large, prominent scales found in bony fish. Instead they're covered with smaller, tooth-like scales called denticles. These tough, protective denticles are aligned so that they channel water over the shark's body, minimizing drag due to friction.
Like bony fish, sharks breathe by extracting dissolved oxygen from water. The water enters the mouth, passes through the gills and is expelled through gill slits behind the head. In bony fish, these slits are covered, but in most sharks you can see them clearly. As the water flows through the gill opening, it passes tiny gill filaments. These filaments are covered with microscopic blood vessel capillaries, which have a lower oxygen content than the water around them. This imbalance causes oxygen in the water to diffuse into the shark's bloodstream, where it is distributed throughout the body.
Some sharks have a gill pump, a set of muscles that suck in water and push it past the gills. This works something like our lungs — the shark can continuously gather oxygen while it is in a still position. Most sharks also extract oxygen using ram ventilation, passing water over the gills by moving forward. Some highly-active sharks depend on ram ventilation almost entirely, which means they stay in motion most of the time!
Info via: How Stuff Works
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the-abyssopelagic: a scalloped hammerhead (Sphyrna lewini)
a scalloped hammerhead (Sphyrna lewini)
chasinglinnaeus: Hammerhead shark (Sphyrna zygaena), Sea of...
Hammerhead shark (Sphyrna zygaena), Sea of Cortez
pythvn: Hammerheads are my fave kind of shark.
Hammerheads are my fave kind of shark.
discovery: Great hammerhead sharks are nomadic and have been...
Great hammerhead sharks are nomadic and have been known to roam all the way from the coasts of Florida to polar regions. This aquatic globetrotting lets them take advantage of rising and falling water temperatures.
More shark facts, here: http://bit.ly/14xU6Yr
eqiunox: Out of the Darkness by JenFu Cheng on Fivehundredpx
luxured: daysanddaze: Langford Island, Whitsundays | Australia...
Imagine walking on the part where the sand gets submerged in the water a little bit
Ohh Do I Want To Be There!! :-D
iheartsharks: (via nch1) (via iheartsharks)
(via nch1)
(via iheartsharks)
trynottodrown: source
mermaidswineglass: Blue Shark
Blue Shark
theblueshark: Photo by shane gross This is my cousin,...
Photo by shane gross
This is my cousin, cousinofblueshark.
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