Growing acclaim for the UK's Responsible Fishing Scheme (organised by Seafish) has attracted tuna long line fishermen from Sri Lanka – those who supply tuna to supermarket chain Morrisons.

Having recently achieved certification in the Responsible Fishing Scheme (RFS), 20 boats working from the port of Beruwala may attract others to increase international status for their product.

Operating through Tuna King (Tuna Retail Sales Ltd) those fishermen ensure an unbroken supply chain, says Seafish, a spokesman adding when fish is hauled it is processed and stored by using an exclusive onboard processing and control system that reduces wastage.

"When the fish arrives at the Tuna King factory in the UK, the fish is repacked and sent to retailers, meaning the catching and supply chain is unbroken," said Mick Bacon, Seafish project manager for the RFS.

James Weerawardena, Tuna King's owner, said: "I chose to support the RFS because I believe it is one of the most important and credible sustainability schemes available for fishermen. The criteria and practises for certification are straightforward and our fishermen were able to adopt the rules of the scheme without any problems.

"I had great support and encouragement from Matthew Bailey, the Morrisons fish buyer. This commitment to Tuna King and our sustainability programme made it possible to become the first RFS certified tuna producer.

"One of the most valuable features of the RFS is that it is relevant to all species, not just tuna.

"I urge other businesses to support the scheme."