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    ÀÌ    ¸§     |     °ü¸®ÀÚ µî·ÏÀÏ     |     2023-03-29 Á¶    È¸     |     689
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    µî·ÏÀÏ     |     2023-03-29

    How this little see-through fish gets its rainbow shimmer

    ÀÌ ÀÛÀº Åõ¸í ¹°°í±â°¡ ¹«Áö°³ ºûÀ» ¹ßÇÏ´Â ¹æ¹ý



    Ghost catfish get their rainbow iridescence from transparent muscles 

    À¯·É ¸Þ±â´Â Åõ¸íÇÑ ±ÙÀ°À¸·ÎºÎÅÍ ¹«Áö°³ ºûÀ» ¾ò½À´Ï´Ù

     




     

     

    Aside from their heads and spines, ghost catfish (Kryptopterus vitreolus) are almost completely transparent. When light shines through their bodies, they take on a colourful iridescent shimmer despite having no pigment in the transparent parts of their bodies

    ¸Ó¸®¿Í °¡½Ã¸¦ Á¦¿ÜÇÏ°í À¯·É ¸Þ±â( Kryptopterus vitreolus )´Â °ÅÀÇ ¿ÏÀüÈ÷ Åõ¸íÇÕ´Ï´Ù. ¸ö¿¡ ºûÀÌ ºñÄ¡¸é ¸öÀÇ Åõ¸íÇÑ ºÎºÐ¿¡ »ö¼Ò°¡ ¾øÀ½¿¡µµ ºÒ±¸ÇÏ°í ´Ùä·Î¿î ¹«Áö°³ ºû±òÀ» ¶ç°Ô µË´Ï´Ù

     

     

    Its skin is almost completely transparent. But when the light hits it just right, its body flickers with shimmering rainbow colors.

    ÇǺΰ¡ °ÅÀÇ ¿ÏÀüÈ÷ Åõ¸íÇÕ´Ï´Ù. ±×·¯³ª ºûÀÌ Á¦´ë·Î ºñÃß¸é ¸öÀÌ ¹Ý¦ÀÌ´Â ¹«Áö°³ »öÀ¸·Î ±ô¹ÚÀÔ´Ï´Ù.

     

     

    Now, scientists have figured out how this fish — called the ghost catfish — creates its iridescent glow.

    That glow comes from within, according to a study published Monday in the journal Proceedings of the National Academy of Sciences. As light passes through the fish's skin, it hits tiny structures in the muscle that turn the light into a colorful spectrum.

    ÀÌÁ¦ °úÇÐÀÚµéÀº À¯·É ¸Þ±â¶ó°í ºÒ¸®´Â ÀÌ ¹°°í±â°¡ ¹«Áö°³ ºûÀ» ¹ß»êÇÏ´Â ¹æ¹ýÀ» ¾Ë¾Æ³Â½À´Ï´Ù.

    ¿ù¿äÀÏ¿¡ National Academy of Sciences Àú³Î¿¡ ¹ßÇ¥µÈ ¿¬±¸¿¡ µû¸£¸é ±× ºûÀº ³»ºÎ¿¡¼­ ³ª¿É´Ï´Ù. ºûÀÌ ¹°°í±âÀÇ ÇǺθ¦ Åë°úÇÒ ¶§ ±ÙÀ°ÀÇ ÀÛÀº ±¸Á¶¿¡ ºÎµúÇô ºûÀ» ´Ùä·Î¿î ½ºÆåÆ®·³À¸·Î ¹Ù²ß´Ï´Ù.

     



     

     

    The ghost catfish — sometimes known as the glass catfish — is a small species native to rivers in Thailand, averaging just a few inches (centimeters) long. It¡¯s sold around the world as an aquarium fish.

    ¶§¶§·Î À¯¸® ¸Þ±â·Î ¾Ë·ÁÁø À¯·É ¸Þ±â´Â ű¹ÀÇ °­¿¡ ¼­½ÄÇÏ´Â ÀÛÀº Á¾À¸·Î Æò±Õ ±æÀÌ°¡ ¸î ¼¾Æ¼¹ÌÅÍ¿¡ ºÒ°úÇÕ´Ï´Ù. Àü ¼¼°èÀûÀ¸·Î ¼öÁ·°ü ¹°°í±â·Î ÆǸŵǰí ÀÖ½À´Ï´Ù.

     

     

    Other creatures are also iridescent, creating the shimmering rainbow effect where colors shift as you move. Usually, they have shiny outer surfaces that reflect the light — like a hummingbird¡¯s feathers or a butterfly¡¯s wings, explained Arizona State University biologist Ron Rutowski, who was not involved with the research.

    ´Ù¸¥ »ý¹°µéµµ ¹«Áö°³ ºû±òÀ̾ ¿òÁ÷ÀÏ ¶§¸¶´Ù »ö»óÀÌ ¹Ù²î´Â ¹Ý¦ÀÌ´Â ¹«Áö°³ È¿°ú¸¦ ¸¸µì´Ï´Ù. ÀϹÝÀûÀ¸·Î ±×µéÀº ¹ú»õÀÇ ±êÅÐÀ̳ª ³ªºñÀÇ ³¯°³Ã³·³ ºûÀ» ¹Ý»çÇÏ´Â ¹Ý¦ÀÌ´Â ¿ÜºÎ Ç¥¸éÀ» °¡Áö°í ÀÖ´Ù°í ¿¬±¸¿¡ Âü¿©ÇÏÁö ¾ÊÀº ¾Ö¸®Á¶³ª ÁÖ¸³ ´ëÇÐÀÇ »ý¹°ÇÐÀÚ Ron Rutowski´Â ¼³¸íÇß½À´Ï´Ù.

     

     

    As the ghost catfish swims, those muscles relax and tighten, sending off a glinting range of colors.

    À¯·É ¸Þ±â°¡ Çì¾öÄ¥ ¶§ ±ÙÀ°ÀÌ À̿ϵǰí Á¶¿©Áö¸é¼­ ¹Ý¦ÀÌ´Â ´Ù¾çÇÑ »ö»óÀ» ¹ß»êÇÕ´Ï´Ù.

     

     

    Instead, it has tightly packed structures in the muscles that can bend light into rainbow hues, which researchers found after shining different lights and lasers onto its body in the lab. As the ghost catfish swims, those muscles relax and tighten, sending off a glinting range of colors.

    ´ë½Å, ±×°ÍÀº ºûÀ» ¹«Áö°³ »öÁ¶·Î ±¼Àý½Ãų ¼ö ÀÖ´Â ±ÙÀ°¿¡ »ª»ªÇÏ°Ô Ã¤¿öÁø ±¸Á¶¸¦ °¡Áö°í Àִµ¥, ¿¬±¸¿øµéÀº ½ÇÇè½Ç¿¡¼­ ´Ù¸¥ ºû°ú ·¹ÀÌÀú¸¦ ¸ö¿¡ ºñÃß°í ³ª¼­ ¹ß°ßÇß½À´Ï´Ù. À¯·É ¸Þ±â°¡ Çì¾öÄ¥ ¶§ ±ÙÀ°ÀÌ À̿ϵǰí Á¶¿©Áö¸é¼­ ¹Ý¦ÀÌ´Â ´Ù¾çÇÑ »ö»óÀ» ¹ß»êÇÕ´Ï´Ù.

     


     

     

     

    And the very see-through skin, which lets in around 90% of outside light, is essential: "We wouldn't be able to see the colors if the skin of the fish is not so transparent," Zhao said

    ±×¸®°í ¿ÜºÎ ºûÀÇ ¾à 90%¸¦ ¹Þ¾ÆµéÀÌ´Â ¸Å¿ì Åõ¸íÇÑ ÇǺδ ÇʼöÀûÀÔ´Ï´Ù.

    ¹°°í±âÀÇ ÇǺΰ¡ ±×·¸°Ô Åõ¸íÇÏÁö ¾ÊÀ¸¸é »ö»óÀ» º¼ ¼ö ¾øÀ» °Í"À̶ó°í ¸»Çß½À´Ï´Ù.

     

     

    Most iridescent fish shine because of structures in their scales or skin, but the transparent ghost catfish gets its shine from prism-like structures in its muscle fibres

    ´ëºÎºÐÀÇ ¹«Áö°³ºû ¹°°í±â´Â ºñ´ÃÀ̳ª ÇǺÎÀÇ ±¸Á¶ ¶§¹®¿¡ ºûÀ» ¹ßÇÏÁö¸¸ Åõ¸íÇÑ À¯·É ¸Þ±â´Â ±ÙÀ° ¼¶À¯ÀÇ ÇÁ¸®Áò°ú °°Àº ±¸Á¶¿¡¼­ ºûÀ» ¹ßÇÕ´Ï´Ù.

     

     

    ¡°Actually, we spent quite some time at the beginning looking for photonic structures in the skin, and we started to study the muscle only for the purpose to explain why it is so transparent, until after several months we realised that it is the muscles that has caused the diffraction colours,¡± says Zhao. The researchers found that the colours come from muscle fibres called sarcomeres, which mediate the contraction and relaxation of muscles.

    »ç½Ç óÀ½¿¡´Â ÇǺÎÀÇ ±¤±¸Á¶¸¦ ã´Â µ¥ ²Ï ¸¹Àº ½Ã°£À» º¸³Â°í ±ÙÀ°ÀÌ Åõ¸íÇÑ ÀÌÀ¯¸¦ ¼³¸íÇϱâ À§ÇÑ ¸ñÀûÀ¸·Î¸¸ ±ÙÀ°À» ¿¬±¸Çϱ⠽ÃÀÛÇß½À´Ï´Ù. ¸î´ÞÈÄ¿¡ ¿ì¸®´Â ȸÀý »ö»óÀ» À¯¹ßÇÑ °ÍÀÌ ±ÙÀ°À̶ó´Â °ÍÀ» ±ú´Þ¾Ò½À´Ï´Ù. ¿¬±¸¿øµéÀº »öÀÌ ±ÙÀ°ÀÇ ¼öÃà°ú ÀÌ¿ÏÀ» ÁßÀçÇÏ´Â ±ÙÀý(sarcomeres)À̶ó°í ºÒ¸®´Â ±ÙÀ° ¼¶À¯¿¡¼­ ³ª¿Â´Ù´Â °ÍÀ» ¹ß°ßÇß½À´Ï´Ù.

     

     

    When light shines through the fish, these sarcomeres act something like prisms, breaking the light into its constituent colours. While these structures may occur in other types of fish too, we can only see them in ghost catfish because the fish are so small – just a few centimetres long – and so transparent.

    ºûÀÌ ¹°°í±â¸¦ ÅëÇØ ºû³¯ ¶§, ÀÌ ±ÙÀýÀº ÇÁ¸®Áò°ú °°Àº ¿ªÇÒÀ» ÇÏ¿© ºûÀ» ±¸¼ºÇÏ´Â »ö»óÀ¸·Î ºÐÇØÇÕ´Ï´Ù. ÀÌ·¯ÇÑ ±¸Á¶´Â ´Ù¸¥ À¯ÇüÀÇ ¹°°í±â¿¡¼­µµ ¹ß»ýÇÒ ¼ö ÀÖÁö¸¸ À¯·É ¸Þ±â¿¡¼­¸¸ º¼ ¼ö ÀÖ½À´Ï´Ù. ¹°°í±â´Â ±æÀÌ°¡ ¸î ¼¾Æ¼¹ÌÅÍ¿¡ ºÒ°úÇÒ Á¤µµ·Î ÀÛ°í Åõ¸íÇϱ⠶§¹®ÀÔ´Ï´Ù.

     

     

     

    In the wild, this iridescence may be useful for communication with other fish or to hide the catfish¡¯s shadows from deeper-swimming predators, Zhao says. Other transparent fish, such as eel larvae and icefish, may get their shine in similar ways

    ¾ß»ý¿¡¼­ ÀÌ ¹«Áö°¹ºûÀº ´Ù¸¥ ¹°°í±â¿Í ÀÇ»ç¼ÒÅëÇϰųª ´õ ±íÀº °÷¿¡¼­ Çì¾öÄ¡´Â Æ÷½ÄÀڷκÎÅÍ ±×¸²ÀÚ¸¦ ¼û±â´Â µ¥ À¯¿ëÇÒ ¼ö ÀÖ´Ù°í Zhao´Â ¸»ÇÕ´Ï´Ù. ¹ìÀå¾î¾Ö¹ú·¹¿Í ºù¾î¿Í °°Àº ´Ù¸¥ Åõ¸íÇÑ ¹°°í±âµµ ºñ½ÁÇÑ ¹æ½ÄÀ¸·Î ºûÀ» ¹ßÇÒ ¼ö ÀÖ½À´Ï´Ù.

     

     

     



     
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