There are all kinds of amazing animals in
the ocean. Some of them are completely unknown by the
average person. The nudibranch is one such curious animal. A nudibranch is basically a snail with no
shell, sometimes called a sea slug. The bushy tuft on the back of this nudibranch
is actually the animal’s gills, which is where nudibranchs get their name. Nudibranch means means “naked-gill.” There are thousands of species of nudibranchs
in the world’s oceans in thousands of different color patterns, which makes them very popular
with underwater photographers. But the bright coloration isn’t just designed
to look cool. Scientists call it aposematic—it’s designed
to warn predators that it won’t make a good meal. Most nudibranchs produce foul tasting toxins
or acids in the form of a slime on their skin. Fish won’t eat them no matter how tempting
they might look. Unfortunately, nudibranchs are not the fastest
animals on the reef, and they are somewhat rare too. Finding a mate under such circumstances can
be challenging. So nudibranchs are hermaphrodites, meaning
each individual has both male and female organs. When any two nudibranchs of the same species
meet up, they are always compatible because they are both male and female. They approach each other, extend sexual organs
from the side of their bodies, and exchange both eggs and sperm with each other. Each will then go off and lay their fertilized
eggs. This brightly colored nudibranch egg mass
is produced by the equally brightly colored Spanish Dancer nudibranch. It is one of the largest nudibranchs on Pacific
coral reefs, reaching the size of a cucumber. The Spanish Dancer gets its name from the
way it avoids predators. When threatened, it can escape by swimming
away like a flamenco dancer. The animal has little control over the direction
it swims, but it gets up into the water column and away from the predator. Eventually, the nudibranch stops undulating
and assumes a gliding position to parachute back down to the reef, hopefully out of harm’s
reach. The Spanish Dancer also serves as a kind of
magic carpet. It’s passenger: an Imperial shrimp. This is transportation that offers protection
from predators, as well as a steady supply of food. The shrimp feeds on the poop of the nudibranch! In exchange for the free room and board, the
shrimp keeps the tufted gills of the nudibranch clean. While the Spanish Dancer is big, some nudibranchs
are bigger. The Lemon Peel Nudibranch found in the northern
Pacific reachs a foot long, making this a small one! And while fish won’t eat it, people do. In the Russian Kuril Islands, it is considered
a delicasy. Nudibranchs are found in all the world’s
oceans, even in the freezing water around Antarctica! Nudibranchs are one of the great things about
life in the ocean, where even a lowly Sea Slug can be a thing of beauty.

48 thoughts on “Nudibranchs | JONATHAN BIRD’S BLUE WORLD Extra

  1. As a diver I do really love your video. And finally you made a video about nudi!!
    wish can do more.
    Nudi is one of incredible underwater animals.
    Colourful, different size. can see them in anywhere !!

  2. It's awesome how the whole animal kingdom works. For instance, cheetahs are super fast so it's hard for gazelle and other animals to escape, however cheetahs can't run full speed for long cause their brain overheats, but gazelle has a cooling system to cool the brain so it can run long distances without stopping. Here, this animal puts out an odor to fool predators. Awesome how everything is created, but we have ppl who will eat anything and ruin all the nature. Real predators if you ask me. Good vid, John!

  3. You are too close from the animal thats i saw in a video its like jellyfish but not swiming and have a big mouth u will never believe the size of it mouth!!!

  4. This is great! I recently a few months ago made a channel but I've been on youtube for years, and now I finally want to say that I love your channel!

  5. hey Jonathan do you know someone named Bryan Stafford im taking scuba lessons with him ive always wanted to scuba dive Bryan said that you dived with him 10 years ago

  6. I love nudibranchs, they are indeed beautiful. You got footage of a lot of really cool species! Congratulations, love the videos.

  7. Jellyfish have stinging cells called nematocysts which shoot spears of venom when triggered. When a nudibranch eats a jellyfish, it stores the venomous cells in those hair-like structures without setting off the triggers. Imagine a shooter game where you appropriate the weapons from anyone you defeat and that's a nudibranch.

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