我县环城河水库面积400余亩,绕县城分4块水面,库水由城市生活用水和天然雨水组成,水质肥,淤泥平均厚40厘米,最厚达60厘米。该水库采取人工半精养方式养殖,以常规鱼为主,亩产一般在200-300千克。自上世纪八十年代中期水库逐步富营养化,尤其至九十年代中期,为追求产量,鱼种放养密 The county Huanchenghe reservoir area of ​​400 mu, around the county divided into four water surface, the reservoir water by the city living water and natural rainwater composition, water quality, the average thickness of sludge 40 cm, the maximum thickness of 60 cm. The reservoir to adopt artificial semi-intensive farming methods to conventional fish-based, generally 200-300 kg per mu. Since the mid-1980s, reservoirs have gradually become eutrophic, especially to the mid-1990s. In pursuit of production, the stocking of fish species