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钓鱼人惊叹:鱼越来越难钓了！养鱼人大喜:我的鱼产量越来越高了。在这一惊一喜的背后是水质富营养化的加剧。由于经济承包制的建立和乡镇企业的发展,大量的化肥、粪肥、生活污水和工业废水源源不断地流入了水库、湖泊、河流、池塘。杭州的西湖、武汉的东湖、北京的官厅水库、云南的滇池等大大小小的水域都被渔业科研部门认定为富营养水体了。水变肥厂,饵料丰富了,鲢、鳙、鲩、鳊等中、上层鱼的产量提高了,而我们常钓的鲫、鲤等底层鱼的生态环境改变了。老渔谚、老经验受到了新的挑战。我们钓鱼人不得不深入到淡水鱼类生态、淡水生物和水化学等知识领域中去认识、去探索。
Fisherman amazing: fish more and more difficult to catch a fishing! Fish farmers overjoyed: my fish production is getting higher and higher. Behind this astonishment is the aggravation of water eutrophication. Owing to the establishment of economic contract system and the development of township and village enterprises, a large amount of fertilizers, manure, domestic sewage and industrial wastewater flow into reservoirs, lakes, rivers and ponds. West Lake in Hangzhou, East Lake in Wuhan, Guanting Reservoir in Beijing and Dianchi Lake in Yunnan Province have all been recognized as eutrophic waters by fishery research departments. Water fertilizer plant, bait is rich, silver carp, bighead carp, big carp, big carp and so on, the output of upper fish is raised, and we often catch the crucian carp, carp and other bottom fish’s ecological environment changed. Old fishing proverb, old experience has been a new challenge. We, anglers, have to go deep into the knowledge areas of freshwater fish ecology, freshwater biology and water chemistry to explore and explore.