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<p>Ponyfishes (Leiognathidae) are an Indo-Pacific family characterized by an anatomically complex system comprising highly sexually-dimorphic circumesophageal light organs and associated structures that allow for the emission of bacterially-generated luminescence. We examined the light-organ system in <i>Deveximentum ruconius</i>, documenting biofluorescent emissions for the first time in ponyfishes. When excited by blue-green light of similar wavelength ranges (~ 480–490&#xa0;nm) emitted by symbiotic luminescent bacteria housed in ponyfish light organs (<i>Allivibrio</i>, <i>Photobacterium</i>, and <i>Vibrio</i>), the subopercular lateral isthmus region fluoresces strongly in green and into red wavelengths. Translucent patches in the subopercular isthmus receive light from the anterior light organ lobes via transparent muscular and connective tissues surrounded by reflective guanine. Fluorescent emissions also occur along the lateral midline, the pectoral and pelvic fin bases, and distally on the dorsal and caudal fin rays (largest individual examined). The strongest biofluorescent emissions occur from the translucent patches in the subopercular isthmus and pectoral fin base, suggesting that bacterially-generated light produced in the light organ may be exciting fluorescent emissions in this species, a rarely documented phenomenon in fishes. Members of all 10 leiognathid genera were examined, however, <i>D. ruconius</i> was the only species within the family Leiognathidae that exhibited fluorescence of any kind.</p>

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Bacterial bioluminescent wavelengths elicit biofluorescent emissions in the ponyfish genus Deveximentum

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月11日

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  • Rene P. Martin,
  • Emily M. Carr,
  • Michael J. Ghedotti,
  • John S. Sparks

摘要

Ponyfishes (Leiognathidae) are an Indo-Pacific family characterized by an anatomically complex system comprising highly sexually-dimorphic circumesophageal light organs and associated structures that allow for the emission of bacterially-generated luminescence. We examined the light-organ system in Deveximentum ruconius, documenting biofluorescent emissions for the first time in ponyfishes. When excited by blue-green light of similar wavelength ranges (~ 480–490 nm) emitted by symbiotic luminescent bacteria housed in ponyfish light organs (Allivibrio, Photobacterium, and Vibrio), the subopercular lateral isthmus region fluoresces strongly in green and into red wavelengths. Translucent patches in the subopercular isthmus receive light from the anterior light organ lobes via transparent muscular and connective tissues surrounded by reflective guanine. Fluorescent emissions also occur along the lateral midline, the pectoral and pelvic fin bases, and distally on the dorsal and caudal fin rays (largest individual examined). The strongest biofluorescent emissions occur from the translucent patches in the subopercular isthmus and pectoral fin base, suggesting that bacterially-generated light produced in the light organ may be exciting fluorescent emissions in this species, a rarely documented phenomenon in fishes. Members of all 10 leiognathid genera were examined, however, D. ruconius was the only species within the family Leiognathidae that exhibited fluorescence of any kind.