Biodegradable polymers could make fishing nets more environmentally friendly
Fishing nets and other gear are typically made from durable plastics such as polyamide (PA), which can persist in the ocean for very long periods if lost. This contributes to marine plastic pollution and “ghost fishing,” where abandoned gear continues catching marine life.
In the new study, researchers investigated how conventional nylon (PA6) and a biodegradable polymer called PBSAT behave when used as monofilaments in gill nets. The materials were subjected to accelerated ageing tests designed to simulate environmental exposure and wear over time.
Using a range of analytical techniques—including microscopy, mechanical testing, and chemical analysis—the researchers examined how the materials’ structure and surface properties change during degradation. The results show that ageing effects initially occur at the surface of the filaments before progressing deeper into the material.
The findings provide new insights into how biodegradable polymers perform in fishing gear. This knowledge could support the development of more sustainable materials that remain strong during use but degrade more rapidly if the gear is lost at sea.
