In case you wanted to hear even more about sharks than you got to hear in my presentation last week, I am going to use this blog post to dive a little deeper (no pun intended) into the use of technology, specifically Artificial Intelligence, used in shark detection.
To start off, I’ll give a brief overview of the shark problem as it stands on the Cape today. Back in the early to mid 90’s, Massachusetts used to pay a bounty between $1 and $5 for every seal nose that a hunter turned in in order to keep the seal population under control. However, after the Marine Mammal Protection Act of 1972, the systematic killing of seals become a federal crime. In recent years, the seal population on Cape Cod has exploded, and unfortunately for the cape, the predators that followed them are not so cute. Cape Cod is now one of the biggest epicenters of great white shark activity in the world, with the number of shark spottings rising alarmingly fast in the past several years. Back in 2016, a marine biologist said “It’s not if but when, in terms of somebody being fatally attacked” in Cape Cod. “We’ve got seals being eaten within 100 meters of surfers.”And, unfortunately, he was right. On August 15thof this past summer, a 61-year old man was swimming just 10 feet off the shore of Truro Beach when he was attacked by a great white. He had to undergo six extensive surgeries, but he survived the attack. Then, just a few weeks later, on September 15th, 26-year old Arthur Medici was boogie boarding about 30 feet offshore in shallow water when he was fatally wounded when a shark bit down on both of his legs. This was the first fatality in the United States since 2015 and the first fatal incident in Massachusetts since 1936.
Because of the explosion of the seal population on the cape in recent years, the great white problem on the cape is very new, and there is a lot of disagreement on what needs to be done to keep beachgoers safe. Although shark attacks are not extremely common, human shark interaction is only on the rise, meaning that this is not a problem that will be going away any time soon. There will always be people willing to take the risk and continue venturing into the water to swim and surf regardless of the possibility of an attack, so it is important to do all that we can to keep them safe. I was curious what places in other parts of the world where the threat of sharks is nothing new have been doing to deal with the threat, and if there could be an application for AI, and the answer is yes.
A group in Australia called The Ripper Group, in conjunction with The University of Technology Sydney, developed a system called SharkSpotter. SharkSpotter combines breakthrough artificial intelligence (leveraging deep-learning networks and image processing techniques), computing power, and drone technology to identify and alert lifesavers in real time to sharks near swimmers, thereby creating a cost-effective way to monitor beach safety over very large areas.
Developed using machine learning techniques known as “deep learning”, the SharkSpotter system receives streaming imagery from the drone camera and attempts to identify all objects in the scene. Once objects are detected, they are put into one of sixteen categories: shark, whale, dolphin, rays, different types of boats, surfers, and swimmers. If a shark is detected, SharkSpotter provides both a visual indication on the computer screen and an audible alert to the operator. The operator verifies the alert and sends text messages from the SharkSpotter system to the Life Savers on the beach for further action.In an emergency, the drone is equipped with a lifesaving flotation pod together with an electronic shark repellent that can be dropped into the water in cases where swimmers are in severe distress, trapped in a rip, or if there are sharks close by. Conventional techniques such as fixed-wing aircraft spotters and helicopters with human spotters have very low detection accuracy, about 12.5% and 17.1%, respectively. These advanced machine learning techniques significantly improve aerial detection to more than 90% accuracy. After successful trials and fine-tuning of the system, SharkSpotter was used across a dozen popular beaches in New South Wales and Queensland this past summer. The system was developed to help Surf Life Savers monitor the beach more effectively, as opposed to replacing them (as humans are still needed on site to perform any necessary first aid in the event of an incident), and has been received positively by end-users and communities alike, according to a survey recently conducted by The Ripper Group. In January 2018, SharkSpotter was successfully used to rescue two young swimmers caught in a rip tide in Australia. The drone identified the swimmers in distress, flew down the beach about 800 meters from the lifeguard station, and dropped a lifesaving flotation pod. The complete rescue operation took about 70 seconds, much faster than any human-centered effort would have been able to.
The benefits of using AI for Shark Detection can be mainly split into three categories: maintaining beach safety, protecting marine environments, and enhancing tourism.
As I’ve outlined before, the accuracy of using AI to monitor the water is astronomically better than any other methods out there, and as this can be a matter of life and death, any increased accuracy is important. The current most common method of tracking sharks is the use of tags. Scientists will track down sharks, attack a tag to them, and release them again. Because it is too expensive to constantly track them, the tags are connected to certain buoys and notify the team when a tagged shark swims in the vicinity of those buoys. This method is currently used on the Cape and connects with a free downloadable app called Sharktivity. The problem with this, however, is that it is unrealistic to think that all sharks in the vicinity can be tagged (there are well upwards of 100 sharks now, possibly much more), and it doesn’t allow sharks to be actively tracked, only when they are near certain checkpoints.
One common method for shark protection, particularly in Australia and South Africa, is the use of shark nets. However, shark nets are controversial because they are designed to kill potentially dangerous sharks. In the process, nets may also injure or kill non-target animals, including endangered and protected species. If any of you watch Shark Week (highly recommend if you don’t), you’ll know that many kinds of sharks are very endangered and they are extremely vital to maintaining the marine ecosystem, so any way to monitor them while avoiding lethal action if possible is ideal.
Almost all of the places where shark attacks are a concern are also popular tourism destinations (The Cape, Australia), and the local businesses depend on the tourists to keep their community going. Already some business owners in The Cape are concerned for the well-being of their shops. People need to feel safe enough to continue going to and spending money at these destinations, and if the Cape wants to avoid turning into the real-life Amity Island, accurate shark detection is a big and important step in getting there.