Safetynet won this year’s James Dyson Award and is explained on the website of that award program:

Function

The goal of the SafetyNet system is to make commercial fishing more sustainable by significantly decreasing the numbers of non-target and juvenile fish caught during the trawling process. Escape Ring devices form a part of this system, and are currently the focus of the development work. The rings tackle the problem of

holes in a net closing up during trawling when under tension. Many small fish are unable to escape, or are severely injured in the process. Escape Rings hold the meshes open, and a simple light ring acts as an emergency exit sign. The lights make the rings more visible and also stimulate fish escape reactions, guiding them out. All electronic devices are powered by a tested on-board energy harvesting system, meaning that once fishermen fit the devices to their nets they never have to think about them again. When trawls reach the end of their working life, the Escape Rings can be removed and fitted to the new one. The Rings are available in a range of sizes.