Topic

Marine Life

61 facts

  • Biology60 views

    The Humboldt Squid Can Communicate Using Rapid Skin Colour Changes

    Humboldt squid (Dosidicus gigas) can flash complex patterns of colour and light across their skin within milliseconds using chromatophores — pigment-filled sacs controlled by muscles. Research suggests these flashing patterns are a form of communication between individuals, potentially conveying information about prey, danger, or social status. Their skin also contains photoreceptors, meaning they may 'see' with their skin despite being colourblind in their eyes.

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  • Biology59 views

    Octopuses Have Three Hearts, Blue Blood, and Neurons Throughout Their Arms

    Octopuses have three hearts: two branchial hearts pump blood through the gills, while a third systemic heart circulates oxygenated blood to the body. Their blood is blue because it uses haemocyanin (copper-based) rather than haemoglobin (iron-based) to carry oxygen. Most remarkably, about two-thirds of their approximately 500 million neurons are located in their eight arms rather than their central brain, allowing each arm to act semi-independently.

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  • Fish133 views

    Cleaner Wrasse Fish Run Underwater 'Service Stations' for Other Fish

    Cleaner wrasse set up stations on reefs where larger fish queue up to have parasites, dead tissue, and bacteria removed. The cleaner fish even calms stressed clients by gently stroking them with its fins.

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  • Fish116 views

    The Deep Sea Dragonfish Has Transparent Teeth

    The dragonfish's fangs are made of nanocrystalline hydroxyapatite structured to be transparent, making them invisible to prey even in bioluminescent light. This stealth dentistry is unlike any other known predator.

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  • Fish98 views

    Salmon Return to Exactly the Same River Where They Were Born

    Pacific salmon navigate thousands of kilometers of open ocean to return to their exact birth stream using Earth's magnetic field as a compass and the unique chemical scent of their home river, which they memorize as juveniles.

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  • Fish96 views

    Puffer Fish Are the Second Most Poisonous Vertebrate on Earth

    Pufferfish contain tetrodotoxin — a neurotoxin 1,200 times more deadly than cyanide — concentrated in their liver, skin, and ovaries. Despite this, fugu (pufferfish sashimi) is a prized delicacy in Japan prepared by licensed chefs.

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  • Fish85 views

    Anglerfish Females Absorb Their Mates Completely

    When a tiny male anglerfish finds a female, he bites into her skin and fuses permanently. His organs dissolve; he becomes a sperm-producing parasite attached to her body. One female can carry up to six males at once.

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  • Fish78 views

    The Immortal Jellyfish Resets Its Own Biological Clock

    Turritopsis dohrnii can revert from adult back to its juvenile polyp stage through transdifferentiation — where mature cells transform into different cell types. Theoretically, it can repeat this cycle indefinitely, making it biologically immortal.

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  • Fish118 views

    Parrotfish Eat Coral and Poop Out White Sand Beaches

    Parrotfish use their beak-like teeth to scrape algae from coral, accidentally ingesting coral rock. They digest the organic matter and excrete the calcium carbonate as fine white sand — producing hundreds of kilograms per fish per year.

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  • Fish83 views

    Tuna Can Maintain Body Temperature Warmer Than the Ocean

    Unlike most fish, bluefin tuna are partially warm-blooded, using a heat exchange system to keep their muscles and brain warmer than the surrounding water. This allows them to swim faster and hunt in cold deep waters.

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