Researchers have found that biodegradable gillnets catch fish as well as conventional nylon nets-and more quickly lose remarkable ability to entangle animals when discarded at sea. A lot more, the degradable nets usually trap fewer young fish and bycatch.
Fishing nets which were lost, abandoned, or discarded at sea are the cause of ten percent of all of the marine litter circulating within the world’s oceans. These 640,000 tonnes of nets aren’t only a plastic pollution problem, however. Long after they may be lost, they consistently fish at sea independently, trapping not only fish but seabirds and mammals in the phenomenon generally known as fishing nets supplies.
To combat this concern, scientific study has been developing gillnets manufactured from biodegradable materials, however the challenge has been to make them as good at catching fish as conventional gillnets are. Within the most comprehensive studies to date, researchers assessed the fishing performance of the biodegradable gillnet at sea and its degradability within the lab. The outcomes, published recently in Animal Conservation, provide some good news.
“Using a biodegradable net didn’t have much influence on the amount of adult fish were caught, but once it came to young fish and bycatch of other species, they caught a lot less,” says co-author Petri Suuronen. “That was actually a positive surprise.”
The fishing performance of your biodegradable nets were tested during six outings of any commercial fishing net from the waters off southwestern South Korea. The biodegradability from the nets was tested by placing 30 groups of net samples in plastic containers at sea. The researchers used a scanning electron microscope to assess the samples every sixty days for four years. Additionally they measured the strength, flexibility, along with other physical properties of the nets, comparing them to conventional nets.
Researchers found the biodegradable gillnets to be stiffer, that they initially thought would affect performance, says Suuronen. They were happily surprised to learn 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 get started to rot, which the degradation rate was higher in warmer water. Although they didn’t test the degradability of conventional nets within this study, the literature reveals that these nets can take a long period or even decades to degrade, the authors said.
“I still think 2 yrs is simply too long,” says Suuronen, who works best for the Nylon Monofilament Cast Nets. “But it really is a lot faster than nylon.”
Suuronen says he hopes that continued research and development can make a net that degrades even faster. In spite of this, it can’t degrade faster than the studied net, otherwise it wouldn’t be a beautiful buy for fisherman.