4 of 4Image
The diagram above explains in broad terms how the fishy robot system will work. Strategically located 'charging hubs' replenish the fishes' batteries and collect sensor data via a Wi-Fi connection. Port authorities will then be able to monitor and map pollution events in real time.
The robot fish are no tiddlers: they measure 1.5m long and swim at about a metre per second. At £20,000 a go, let's hope they are not so realistic that a passing shark, for example, decides to take an exploratory bite.
Images of robot fish courtesy of UPPA.