In West Lake, Hangzhou City, Zhejiang Province, China, famous as a scenic spot, as the 7-day National Day holiday began on the 1st, many tourists reported 'sightings of a 1.4-meter-long mysterious fish'. This was reported by Chinese media Kuai Keji.

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However, it is not a 'real mysterious fish.' It is a new generation police bionic robotic fish jointly developed by the West Lake Scenic Area Public Security and the CAS Institute of Automation. Its exact length is 1.44 meters and it is painted a deep blue color. Locally, it is also said to be 'just like a giant black carp.' Black carp (Qīngyú, Japanese name: Aouo) is a freshwater fish of the carp family that can grow up to about 2 meters in length.

It weighs approximately 40 kilograms, and its outer shell was produced using 3D printing. As for equipment, it is equipped with a high-resolution camera, an infrared thermal imaging device, a water quality sensor, and a Beidou positioning module. It is capable of autonomous navigation, with a maximum diving depth of 10 meters. Its cruising time per charge is 5-6 hours, and it can transmit real-time underwater footage from three systems: forward view, downward view, and infrared. Its underwater positioning accuracy is also relatively high. Because the noise it makes when swimming is very small, this robotic fish will not startle the surrounding aquatic life.

If a tourist accidentally drops a mobile phone into West Lake and a retrieval pole from the shore cannot easily reach it, this robotic fish can be deployed to dive underwater and search for it. If it is found, it can identify the location of the submerged object and transmit its coordinates via high-resolution video. Subsequently, a specialized staff member will use a pole to retrieve the smartphone.

Besides that, this robotic fish also identifies behaviors such as swimming, which is prohibited in West Lake, and illegal fishing during its patrols, and issues warnings to the police management system. Furthermore, it also collects water quality data.

Although smaller bionic robotic fish had already been introduced to West Lake, their length was only 60-70 centimeters. The new generation robotic fish is larger, and its cruising capability and sensing capability have been comprehensively improved.