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The vibrant freshwater crustacean you see is a Blue Crayfish (Procambarus alleni). With over thirty years in the field, I can tell… The vibrant freshwater crustacean you see is a Blue Crayfish (Procambarus alleni). With over thirty years in the field, I can tell you that few creatures are as captivating to study as this one, whose stunning blue hue is a striking contrast to its typically drab aquatic habitat. This particular coloration is a rare genetic trait that makes it highly prized in the aquarium trade. These crayfish are equipped with long, sensitive antennae that they use to feel for food and navigate their surroundings. They use their powerful claws, known as chelipeds, not only for defense but also for tearing apart detritus and prey. As a keystone species in many ecosystems, they play a crucial role in nutrient cycling and providing food for other aquatic animals.