Scientific study has found that biodegradable gillnets catch fish in addition to conventional nylon nets-and more quickly lose their ability to entangle animals when discarded at sea. A lot more, the degradable nets usually trap fewer young fish and bycatch.
Fishing nets which have been lost, abandoned, or discarded at sea account for ten percent of all of the marine litter circulating inside the world’s oceans. These 640,000 tonnes of nets aren’t just a plastic pollution problem, however. A long time after they are lost, they continue to fish at sea alone, trapping not only fish but seabirds and mammals within a phenomenon referred to as custom fishing nets.
To combat this issue, scientific study has been developing gillnets made from biodegradable materials, although the challenge has been so they are pretty much as good at catching fish as conventional gillnets are. In one of the most comprehensive studies currently, researchers assessed the fishing performance of your biodegradable gillnet at sea and its degradability from the lab. The final results, published recently in Animal Conservation, provide some good news.
“Using a biodegradable net didn’t have much effect on the amount of adult fish were caught, but when it stumbled on young fish and bycatch of other species, they caught significantly less,” says co-author Petri Suuronen. “That was actually a positive surprise.”
The fishing performance of the biodegradable nets were tested during six outings of a commercial cheap fishing nets within the waters off southwestern South Korea. The biodegradability of the nets was tested by placing 30 groups of net samples in plastic containers at sea. They used a scanning electron microscope to assess the samples every sixty days for 4 years. Additionally, they measured the strength, flexibility, and other physical properties of your nets, comparing these to conventional nets.
Researchers found the biodegradable gillnets to become stiffer, they will initially thought would affect performance, says Suuronen. These people were amazed to determine that this failed to. Their stiffness can be why they caught less bycatch and juveniles, however, Suuronen says. Researchers found out that it took 24 months 12dexipky the biodegradable net to begin with to rot, which the degradation rate was higher in warmer water. While they didn’t test the degradability of conventional nets with this study, the literature shows that these nets can take a few years or perhaps decades to degrade, the authors said.
“I still think 2 years is too long,” says Suuronen, who works best for the Nylon Monofilament Cast Nets. “But it is a lot faster than nylon.”
Suuronen says he hopes that continued research and development can produce a net that degrades even faster. Nevertheless, it can’t degrade much quicker compared to the studied net, otherwise it wouldn’t be a beautiful purchase for fisherman.