1. currentsinbiology:


    In the dark of the ocean, some animals have evolved to use bioluminescence as a defense. In the animation above, an ostracod, one of the tiny crustaceans seen flitting near the top of the tank, has just been swallowed by a cardinal fish. When threatened, the ostracod ejects two chemicals, luciferin and luciferase, which, when combined, emit light. Because the glow would draw undesirable attention to the cardinal fish, it spits out the ostracod and the glowing liquid and flees. Check out the full video clip over at BBC News. Other crustaceans, including several species of shrimp, also spit out bioluminescent fluids defensively. (Image credit: BBC, source video; via @amyleerobinson)

    This is beyond cool!

    (via ichthyologist)

  2. rhamphotheca:

    When Fish Go Deeper They Glow Brighter

    by Stephanie Pappas

    Deep-diving fish have a problem: The only light that penetrates their watery environment is blue and green — hardly enough of a palette for flashy color patterns.

    Now, a new study reveals these fishes’ solution: In deep water, fish simply fluoresce more — a technique that allows them to convert blue-green light into red light.

    "Under light conditions that do not provide the full spectrum — the full rainbow of colors that we have at the surface — it’s really nice to have fluorescence, because you can still have those missing colors,” said study researcher Nico Michiels, a professor at the University of Tüebingen in Germany…

    (read more: Discovery Science)

    image via: AMNH

    (via ichthyologist)

  3. griseus:

    A redeye gaper (Chaunax sp.) venting water at 240 meters depth. Seen during the Lophelia II 2008 expedition at the Green Canyon site in the Gulf of Mexico.

    Gapers are Lophiiformes, in the anglerfish group, with big heads, a network of open sensory canals,and a lateral canal extending posteriorly along a compressed trunk and tail. They are sit-and-wait, ambush predators

    (via ichthyologist)

  5. asapscience:

    A large school of mobula rays fades into the waters of Baja, Mexico. “The rays were moving quite fast and it was hard enough keeping up with them from the surface, let alone diving down to take a closer look,” writes photographer Eduardo Lopez Negrete. Mobula rays are often referred to as flying rays due to their fondness for breaching.” — the 2014 National Geographic Traveller Photo Contest

    Let’s also keep in mind that a mobula ray can reach 17 foot (5.2 meter) wingspan and weigh over a ton. Freaky or cool? 

    via Sploid

    (via ichthyologist)

  6. whatthefauna:

    Bobtail squid are tiny nocturnal cephalopods that only reach about 2 inches long. In the daytime, they use their tentacles to bury themselves under the sand and remain undisturbed.

    Here is an awesome video of one burying itself.

    Image credit: Alexius Sutandio

    (via coffeeandtentacles)

  7. thelovelyseas:

    Nudibranchs by David Hall

  9. rhamphotheca:

    Baby Flamboyant Cuttlefish (Metasepia pfefferi) in egg, Negros Oriental, Philippines

    Although still inside of its egg, these flamboyant cuttlefish were still able to flash dark purple if something got too close. when they are born they will be ready to hunt and change color on their own...”

    photograph/comments by Dan Geary

    (via: Project Noah)

    (via invertebrate-science)

  10. rhamphotheca:

    A deep sea octopus with deep-sea mussles,  a serpent star, and cup corals in Norfolk Canyon, off the shore of Virginia.

    from the Deepwater Canyons expedition, 2013 , Pathways to the Abyss


  11. dynamicoceans:

    Horned shark hatching

    (via ichthyologist)

  14. fuckyeahaquaria:

    Variable Aphelodoris | Aphelodoris varia

    (by richard ling)

    (via fuckyeahbranchs)