Mysterious circular patterns discovered in Lam Tsuen River, Tai Po, Tilapia fish identified as the culprit

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14th April 2024 – (Hong Kong) The Lam Tsuen River in Tai Po has become the centre of attention as netizens speculate about the presence of extraterrestrial visitors leaving behind peculiar circular imprints. Several photos posted on social media platforms by internet users reveal dozens of uniformly shaped and seemingly artificially constructed circular depressions on the riverbed of Lam Tsuen. The images garnered significant attention, with one photo also highlighting the murky condition of the upstream river water. The post immediately sparked a flurry of comments from netizens, some of whom attempted to unravel the mystery by citing relevant information, earning admiration from many others.

Another hot topic that emerged on a local social media platform was the enigmatic sinkholes observed in the Lam Tsuen River, which quickly ignited a lively discussion among netizens. Some remarked that such phenomena occur every year, while others humorously quipped that it was the result of Goku’s missed blow against Buu, causing him to plunge into the river. However, some netizens dismissed these speculations as mere superstition stemming from ignorance. In fact, several other internet users shed light on the truth behind the mysterious circular patterns, revealing that they are actually the nesting sites of Tilapia. These fish exhibit unique reproductive behaviour, where mature males become vibrant in colour during their mating period and individually dig shallow, swirling nests along the shallow waters of the riverbank. The nests typically have a diameter of approximately 30 to 40 centimetres and a depth of 10 to 20 centimetres. If a female fish approaches, the male fish may even coerce her into the nest for mating.

According to available data, Tilapia fish boasts astonishing reproductive rates and possess remarkable pollution tolerance. However, they tend to encroach upon the natural habitats of indigenous fish species, classifying them as invasive species. The International Union for Conservation of Nature’s Invasive Species Specialist Group (ISSG) has even listed Tilapia among the top 100 invasive species worldwide. These fish were introduced to southern China around 1954.