一、渔业发展现状历史上古黄河在延津流经四千年漫长岁月,由于频繁决口、泛滥、漫溢、改道、迁徒后在县境西部留下南北长31公里,东西宽7～8公里的黄河故道,大沙河从中纵穿全区。大沙河区域低洼,形成自然滞洪区,主河槽平均水深1～1.8米,两岸滩涂0.2～0.4米,边缘湿地下挖0.4～1米 I. History of Fishery Development The ancient Yellow River flows through Yanchang for four thousand years. Due to frequent rippling, overflowing, overflowing and diversion, the Yellow River left 31 kilometers north to south and 7 to 8 kilometers from east to west in the western part of the county The old course of the Yellow River, Dasha River through the region. Dashahe low-lying areas, the formation of natural detention area, the main channel of the average depth of 1 to 1.8 meters, 0.2 to 0.4 meters on both sides of the beach, the marginal wetlands to dig 0.4 to 1 meter