K&C Fisheries Global's Keith Bell was contracted to remove european carp from the water by Griffith City Council in a bid to improve the water quality.

Mr Bell said the operation - which wrapped up on Tuesday - went "really well" and saw him and his assistant remove 2275 kilograms carp from the lake.

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The biggest carp pulled out of the water was "about 8 kilograms".

As well as carp, "hundreds" of turtles and a singular yabbie also ended up getting caught in the nets and were returned to the lake.

"Yeah we've made a dent obviously," Mr Bell said, reflecting on the operation.

All the carp removed were taken to Deniliquin, where Mr Bell sold them to Charlie Carp, so that they can be turned into liquid fertiliser.

Mr Bell said he is considering coming back in the future to help finish the job.

"I believe that I can probably go back there for 3 days under my own steam and probably make it commercially viable for myself," he said.

"But then that will be the end of it and we would have lowered the amount of carp by 50 per cent then."

European carp are considered an invasive species and have a well-documented negative impact on Australian waterways.

According to the Commonwealth Environmental Water Office carp reduce water quality, damage riverbanks and contribute to blue-green algae blooms.

Mr Bell said helping improve the quality of waterways made him "proud" of the work he was doing.

"I've got to a point in my life where commercial carp harvesting is what I do, but I've got a bigger research and community aspect of my life now."

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"Me being in there for five or six days, I've learned so much about the place ... so I have a lot of information that I'm happy to share with people to help with these situations.

"So I've become proud of what I'm doing. It's not just about catching fish."

Mr Bell plans to donate 50 per cent of the money from selling the carp to Griffith Base Hospital, once he figures out the correct process to do so.