By now you’ve probably heard the phrase that we know more about the surface of the moon than we do about the bottom of the ocean. In fact, more humans have walked on the surface of the moon than have reached the deepest parts of the ocean floor (the Challenger Deep in the Mariana Trench of the Pacific Ocean). To be honest, only four descents have ever been achieved in this nearly 11 km deep hole in the ocean floor. Even to this day we don’t have exact measurements of its depth or what (if anything) actually lives at such depths. The secret lives of fish if you will. And why is this? Well, it may sound stupid, but for one thing, we can actually see the moon from Earth. Yes, at a very fundamental level, it is cheaper and simpler to study the surface of the moon than the bottom of the ocean. Galileo could easily examine the stars and map the surface of the moon. Examine underwater volcanoes and map the bottom of the ocean? Not so much. It’s simply a matter of accessibility.
These days, however, things are changing. There are more and more expeditions into the ocean’s depths and what they are bringing back can be quite interesting. These are 25 really deep insights into the lives of fish and other underwater creatures!
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Many lipsticks contains fish scales
Source: wikipedia, Image: wikipedia Herrings talk to each other through their farts
Source: nytimes There are several species of fish that change sex over the course of their lives
Source: wikipedia Greenland sharks eat polar bears and can live to be 200
Source: nationalgeographic, Image: wikipedia Goldfish will lose their color if kept in dark rooms
Source: bbc, Image: wikipedia One pufferfish has enough poison to kill 30 adults
Source: wikipedia, Image: wikipedia Starfish don't have brains the way we do. Instead, they have a large mass of interconnected neurons throughout their bodies (distributed brains)
Source: wikipedia, Image: wikipedia Fish can asphyxiate (drown) in water if it doesn't contain enough oxygen.
Source: wikipedia Sea anemones are not actually plants. They are animals that eat small fish
Source: wikipedia, Image: wikipedia Scientists have discovered a jellyfish that could potentially be immortal (Turritopsis nutricula) because of its remarkable re-generational abilities
Source: livescience, Image: wikipedia You remember how starfish didn't have brains? Well, they don't have blood either. Their "blood" is just filtered ocean water
Source: wikipedia, Image: wikipedia Just like you and me, fish cough
Source: huffingtonpost Fish living in polluted lakes lose their sense of smell
Source: wikipedia, Image: wikipedia Anglerfish mate by melting into each other and then sharing one body
Source: wikipedia, Image: wikipedia Sardine is not actually a species of fish. This name is used for any number of small varieties of pickled fish from herrings to pilchards
Source: wikipedia, Image: wikipedia NYU performed an experiment with a robotic fish. The fish was actually accepted by other fish and even became their leader!
Source: businessinsider The goliath tigerfish eats crocodiles
Source: wikipedia, Image: wikipedia Hanako was a koi fish that lived for 225 years
Source: wikipedia, Image: wikipedia The moon fish (opah) is the only fish that is known to be warm blooded
Source: wikipedia, Image: wikipedia Some species, like the triggerfish, can swim backwards, but most cannot
Source: wikipedia, Image: wikipedia Some fish have tastebuds on their fins
Source: telegraph.co.uk, Image: wikipedia In spite of the fact that we have mentioned starfish several times in this article, they are not actually fish. And neither are jellyfish. Sorry to burst your bubble.
Source: wikipedia Seahorses, however, are fish. And they are the only fish that swim "upright"
Source: wikipedia, Image: wikipedia Male emperor angelfish live in a group with up to 5 females. If the male dies, one of the females turns into a male and becomes the leader
Source: livescience, Image: wikipedia Fish don't add new scales, their existing scales just increase in size
Source: wikipedia, Image: wikipedia 
