四水映绿·豫见两山丨南湾出好鱼 一水养稻虾

Core Viewpoint - The article highlights the successful environmental restoration and sustainable aquaculture practices at Nanwan Lake, which has transformed it into a vital drinking water source and a thriving fishery, benefiting both the local ecosystem and the economy [2][4][5]. Group 1: Environmental Restoration - Nanwan Lake's water quality has improved significantly over the years, achieving a Class II water standard, thanks to environmental remediation efforts that began around 2010 [2][4]. - The lake, built in 1955, serves as a crucial water reservoir for the local population, with a total capacity of 1.355 billion cubic meters and an area of 75 square kilometers [2]. Group 2: Aquaculture and Economic Impact - The lake supports over 20 fish species, with an annual fish production of approximately 200 million pounds and a market value of around 30 million yuan, making "Nanwan Fish" a sought-after product [4]. - The cooperative farming model in nearby villages has led to the production of 750,000 kilograms of rice and 300,000 kilograms of aquatic products annually, generating a total income of 27 million yuan [5][6]. Group 3: Ecological Benefits - The introduction of filter-feeding fish species, such as the white catfish, plays a crucial role in maintaining water quality by consuming nitrogen and phosphorus, thus enhancing the lake's ecological balance [4]. - The water quality at the drinking water source has consistently met the national standards, with significant improvements in the water quality of the main inflow rivers [6].