Aqua Treasures designs, constructs and services beautiful outdoor ponds, primarily in Newton and also in Wellesley, Needham and Weston for both residential and commercial properties. Its specialty is Koi ponds. It also designs, services and maintains salt water and tropical fish tanks and sells aquarium and pond products. The owner has a background in landscaping and floral design and takes great pride in his ponds and fish tanks. Aquatic Treasures stocks ponds mostly with high-quality Koi fish. Aquariums are stocked with marine fish and coral. Another location in Beacon Hill has been open for more than 20 years.