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  • Pictured here are intermediate sea urchins (Strongylocentrotus intermedius) spawning in the evening. Found in the northwest Pacific, this species is one of several that are regularly consumed by people. The orange urchin is a female releasing eggs after detecting sperm that has been released by males.
    strongylocentrotus-intermedius-inter...tif
  • Pictured here are intermediate sea urchins (Strongylocentrotus intermedius) spawning in the evening. Found in the northwest Pacific, this species is one of several that are regularly consumed by people. The orange urchin is female, which releases eggs after detecting sperm that has been released by males.
    strongylocentrotus-intermedius-inter...tif
  • This is a top-down view of a male intermediate sea urchin (Strongylocentrotus intermedius) commencing the process of broadcast spawning.
    strongylocentrotus-intermedius-urch...tif
  • This is a male intermediate sea urchin (Strongylocentrotus intermedius) commencing the process of broadcast spawning. On this particular day, only a few urchins were spawning.
    strongylocentrotus-intermedius-urchi...tif
  • Pictured here are male intermediate sea urchins (Strongylocentrotus intermedius) commencing the spawning process by emitting sperm into the water. Female urchins release eggs upon sensing the sperm. Found in the northwest Pacific, this species is one of several that are regularly consumed by people.
    strongylocentrotus-intermedius-inter...tif
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Tony Wu Underwater Photography

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