A Nudibranch to Know

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Nudibranch (Nudibranchia) or simply called nudi in diving community are wonderful creatures, with odd shapes and vibrant colors one can’t miss them as it crawls on soft or hard corals among the reefs. They are lovely to behold and if you are sensitive on micro and subtle critters, these animals are exceptional.

Here are few facts I gathered about this lovely animal:

  • There are over 3000 identified species of nudi, it would take too wide and long to encounter them all
  • They are color blind or generally have poor vision and can only distinguish dark or light lumination
  • Nudis are hermaphroditic, which means capacitated with both male & female reproductive organs. Being solitary in nature, it needs to maximize their mating ability for reproduction
  • It has very short life span, it can only live not more than one year so there is no chance to encounter the same nudi in the next dive
  • They got their colors from their food, it has the ability to absorb and incorporate the tint & shade of their prey into their tissues such as anemones or sponges
  • Generally, it’s not for human consumption – often referred to as “butterfly of the ocean” due to vivid vibrant color and their intense toxicity – generally their loud color is a warning sign!

I love nudis and my dive won’t be complete if I don’t find one, I would conclude that the particular reef lacks the necessary as habitat for the critters and so not healthy. And I would reflect that perhaps I went too fast not to notice if there was one.  With more than 3000 species, one can imagine how vast and mysterious our ocean can be!

Orange Nudi

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This nudi (risbecia tyroni) is frequently found on pairs in single file, the slug at the back using its head to maintain contact with the one at the front. Tyron’s nudibranch as they are called have an ingenious defense system, just like other nudis they are fond of eating poisonous prey.

Indeed, one needs a keen eye to find them, they are silent and most often lurking on soft corals. We found this in the depths of Puerto Ptincesa, while the viz was far from good we caught sight of it in the yellowish reef almost hiding in the colors. But it was all alone, silently waiting perhaps for its prey.

Have you encountered this nudi?