COTSBot is a small

autonomous underwater vehicle An autonomous underwater vehicle (AUV) is a robot that travels underwater without requiring continuous input from an operator. AUVs constitute part of a larger group of undersea systems known as unmanned underwater vehicles, a classification tha ...

(AUV) long, which is designed by

Queensland University of Technology The Queensland University of Technology (QUT) is a public university, public research university located in the city of Brisbane in Queensland, Australia. It has two major campuses, a modern city campus in Gardens Point, Brisbane, Gardens Point ...

(QUT) to kill the very destructive

crown-of-thorns starfish The crown-of-thorns starfish (frequently abbreviated to COTS), ''Acanthaster planci'', is a large starfish that preys upon hard, or stony, coral polyps (Scleractinia). The crown-of-thorns starfish receives its name from venomous thornlike spines ...

(''Acanthaster planci'') in the

Great Barrier Reef The Great Barrier Reef is the world's largest coral reef system, composed of over 2,900 individual reefs and 900 islands stretching for over over an area of approximately . The reef is located in the Coral Sea, off the coast of Queensland, ...

off the north-east coast of Australia. It identifies its target using an image-analyzing

neural net In machine learning, a neural network (also artificial neural network or neural net, abbreviated ANN or NN) is a computational model inspired by the structure and functions of biological neural networks. A neural network consists of connected ...

to analyze what an onboard camera sees, and then lethally injects the starfish with a

bile salt Bile acids are steroid acids found predominantly in the bile of mammals and other vertebrates. Diverse bile acids are synthesized in the liver in peroxisomes. Bile acids are conjugated with taurine or glycine residues to give anions called bile ...

solution using a needle on the end of a long underslung foldable arm. COTSBot uses

GPS The Global Positioning System (GPS) is a satellite-based hyperbolic navigation system owned by the United States Space Force and operated by Mission Delta 31. It is one of the global navigation satellite systems (GNSS) that provide geol ...

to navigate. The first version was created in the early 2000s with an accuracy rate of about 65%. After training COTSBot with

machine learning Machine learning (ML) is a field of study in artificial intelligence concerned with the development and study of Computational statistics, statistical algorithms that can learn from data and generalise to unseen data, and thus perform Task ( ...

, its accuracy rate rose to 99% by 2019. COTSBot is capable of killing 200 crown-of-thorns starfish with its two liters capacity of poison. COTSBot is capable of performing about 20 runs per day, but multiple COTSBots will be necessary to significantly impact the crown of thorns starfish populations. A smaller version of COTSBot called "RangerBot" is also being developed by QUT.

References

Applied machine learning Artificial neural networks Autonomous underwater vehicles Lethal injection Mechanical pest control Queensland University of Technology Robotic submarines Robots of Australia {{robot-stub