Western rivers could have another tool against European carp, with talk to use the invasive species for fertiliser.

Barwon MP Roy Butler visited company Ocean2Earth's facilities on the NSW far south coast in January to see their process of mixing fish waste and wood to create the product.

Ocean2Earth co-founder Tim Crane said the process would remove the pests from waterways, create local jobs and reduce chemical fertiliser use in agriculture.

"We've got to change the way we've been dealing with carp in the river," Mr Crane said.

"We've got to get away from just a small boat fishing. For this carp thing to work, we want hundreds of tons a week.

"We're on the coast here and we've got boats fishing in the ocean catching thousands and hundreds of tons of fish at a time. So, there's technologies out there.

"It'd be great to see a carp mustering team and maybe a lot of other little fishing teams to work alongside, but to have one main mustering team that can pull up with a truck, a fish pump, a big net and tinnies and purse those fish into a big area then pump them out.

"In a lot of areas down there, you've got a massive woody weeds problem. A lot of properties spend a lot of money on clearing and spraying. You can potentially use them from farms and solve the environmental problem as well."

Member for Barwon Roy Butler and Ocean2Earth co-founder in the Bega Valley in January 2025. IMAGE: supplied

Nothing has been set in stone, although Mr Crane said a Western Plains compost site would ideally be as close to the source material as possible.

He said a facility would "probably" create two or three jobs to operate it, while others would be employed as fishers.

Mr Crane and his brother Kyran launched the Bega Valley-based company in 2019 and have been in talks this month with the Tasmanian government to set up a trial in the state using marine waste that would otherwise go to landfill.

He said the trial is expected to begin within the next six months.

"A product that uses waste and carp to produce high-value soil products has an obvious value to agriculture, consumers and the environment - it ticks a lot of boxes," Roy Butler said.

"Using his product will reduce the need for using chemicals (where it has been used there has already been a substantial reduction) and produce soil with higher nutrients.

"This leads to more nutritious food and better crops."

Chemical fertiliser can be harmful to humans and the environment, according to the International School of Agri Management.

According NSW government, the carp account for about 90 per cent of biomass caught in waterways around the Murray Darling Basin.

They compete with native fish for food and contribute to poor water quality by uprooting vegetation.