Lesley Henderson, Project Director of the Toby Henderson Trust, was approached by Ross Teasdale of Aquatica Northumbria about installing a tropical fish tank at the centre at Whitehouse Farm, Stannington.

Mr Teasdale, who set up the company last month, said: "Recent research in the US has suggested that watching fish can help reduce stress and anxiety, promote relaxation and enhance vital learning abilities — and especially to provide therapeutic benefits for children with autism.''

Mrs Henderson said: "When Ross first contacted me I was fascinated by what he had to say and I was happy to learn more.

"Our organisation has always had its core founded firmly in the field of practical ways in which to support children with autism to learn and achieve. And this seemed a perfect extension to our holistic approach at the centre."

Fiona Simpson, the Specialist Occupational Therapist at the Trust, said: "The visually pleasing movement of the fish, their bright colours and the regular rhythm of the bubbles, as well as the tank itself, create a soothing and calming influence for the children both before and after their play therapy sessions."