Horaglanis Catfish Thrives in Low Oxygen Environments

The Horaglanis catfish is a remarkable species that thrives in environments with low oxygen levels. Its ability to survive in such conditions is a testament to its adaptability.

This catfish can be found in the groundwater of Sri Lanka, where the water is often stagnant and oxygen-depleted. Its presence in these environments suggests that it has evolved specific traits to cope with low oxygen levels.

Horaglanis catfish can survive with very low oxygen levels, as low as 0.7 mg/L, which is significantly lower than the oxygen levels found in most aquatic environments. This ability is likely due to its unique physiology.

Horaglanis populi is a blind catfish species.

The species has a blood-red body and transparent skin.

It has a highly reduced pectoral fin and a shortened spine.

The dorsal and anal fins are long, extending to the tail.

Horaglanis populi is a tiny catfish species.

Genetic analysis has shown that it is genetically much different from all the other known species.

Its genetic diversity and distribution was studied for the first time.

The discovery of Horaglanis populi is a significant one, revealing that the diversity of subterranean fish species is still underestimated.

This new species was found in several Kerala towns, including Malapally, Edanadu, Chengannur, and Thiruvanvandoor, in southern India, about 1,200 miles south of New Delhi.

The genetic distance between Horaglanis populi and other known catfish species is about 13% to 17%.

Horaglanis populi is a unique fish, blind with a blood-red body and transparent skin, and it's strictly aquifer-residing, meaning it only lives in underground water.

It has a highly reduced pectoral fin and a shortened spine, while the dorsal and anal fins are long, extending to the tail.

The name Horaglanis populi, which means "people" in Latin, is a nod to the citizen scientists who contributed to its identification.

The discovery of Horaglanis populi is not an isolated incident, as it was part of a six-year exploratory and citizen-science-backed survey to study the diversity, distribution, and population structure of subterranean fish.

The study was conducted by a team of researchers, including assistant professors Dr. Rajeev Raghavan, Remya L. Sundar, and Neelesh Dahanukar, among others.

Horaglanis alabamensis can survive in low-oxygen environments, which is a unique adaptation for a fish.

This ability is due in part to its slow metabolism, which allows it to conserve energy in oxygen-poor conditions.

In fact, the species can survive with as little as 0.6 milligrams per liter of dissolved oxygen.

Its ability to survive in low-oxygen environments is likely an adaptation to its underground habitat.

This habitat is characterized by limited water flow and low oxygen levels, which would be challenging for many fish species.

Horaglanis alabamensis has also been found to have a relatively small body size, which may help it conserve energy in low-oxygen environments.

This is because smaller fish have a lower metabolic rate, which allows them to survive with less oxygen.