The weather loach, also known as Misgurnus anguillicaudatus, is a freshwater fish native to East Asia. It is recognized for its elongated body and ability to survive in low-oxygen environments. This species can grow up to 10 inches long and is often found in muddy or shallow waters, where it burrows into the substrate. Weather loaches are known for their unique behavior of sensing changes in atmospheric pressure, which can indicate upcoming weather changes. This ability has led to their nickname, as they often become more active before storms. They are popular in aquariums and are sometimes used in traditional medicine.