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Yesterday’s post was heartfelt and quite opulent…but it was also a bit of a downer, so today let’s get back to core strengths and feature one of those amazing Tetraodontiformes which I promised we would be seeing.

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Awww! it is a juvenile yellow boxfish…surely one of the most endearing fish in the ocean.  The yellow boxfish (Ostracion cubicus) is not only as cute as a button, it is also extremely successful.  The fish ranges across the coral reefs of the Indian and Pacific Oceans and can even be found in some parts of the south east Atlantic Ocean.  Adults grow to be 45 centimetres (18 in) and, as with all of us, their bright yellow fades with age.  The fishes mostly eat algae but they are omnivores and will also sample worms, sponges, corals, mollusks, arthropods, and even other fish.

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Because of its cube shape, the boxfish is not a swift swimmer, however it can swim very efficiently and precisely thanks to swift fluttering strokes from its nearly transparent rounded fanlike fins.  Its box shaped skeleton and armored plates gives it great strength and durability which means predators would pretty much have to eat it whole.  This would be a mistake not only because it is a difficult to swallow a hard, sharp cubical fish, but also because the boxfish is capable of releasing the neurotoxin tetrodoxin (TTX) from its skin if it stressed or frightened.  This protects the boxfish from predators (or being stuck in a dead-end job in a cubical), but it also makes this a difficult fish to have in an aquarium.

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This is why the young boxfish are so colorful:  it is a warning not to eat them (or even stress them out).  Can you imagine if this were the case in the affairs of hominids?  The 80s would have been the most poisonous decade ever.  Fortunately, color denotes other things for us primates…which is why looking at yellow boxfish is such a treat.

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