Abstract
This review addresses the growing demand for sustainable alternatives to conventional synthetic nets used in marine and agricultural applications, which are often persistent, poorly degradable, and difficult to manage at end of life. It examines recent developments in biodegradable polymers-particularly polylactic acid (PLA), polyhydroxyalkanoates (PHAs), and poly(butylene adipate-co-terephthalate) (PBAT)-alongside reinforced blends and nanocomposites designed to improve mechanical performance and degradation behavior under real-world conditions. Strategies based on the regeneration of discarded nets, especially those made from polyamide 6 (PA6), are also considered for their potential to close material loops and reduce environmental leakage. A critical analysis of current testing protocols and regulatory frameworks is provided to assess their suitability for novel materials. In addition, this study highlights the emergence of multifunctional nets capable of providing environmental sensing or biological support, marking a transition toward adaptive and ecosystem-responsive designs. Finally, a survey of ongoing European and international projects illustrates scalable pathways for implementing biodegradable and recyclable netting systems, integrating material innovation with circular economy strategies. These findings emphasize the need for harmonized standards, targeted environmental testing, and cross-sectoral collaboration to enable the large-scale adoption of sustainable net technologies.