【摘要】 武汉市新洲区涨渡湖渔业生产是以人工投放、天然生长为主,鱼类资源自然增殖为辅的粗放型管理模式进行。1992~2004年捕捞产量变幅范围为(3.69~50.61)×104kg,其中有9个年份变幅在10×104kg以上;产品收入变幅范围为(2.77~201.77)×104元,其中有6个年份变幅在50×104元以上。目前涨渡湖鱼类共有47种,与历史最高种数比较,下降了38.2%。渔获物组成中,放养鱼类占80%以上,人工放养是目前涨渡湖鱼类补充群体的主要来源;鱼类年龄结构简单,主要经济鱼类低龄化趋势严重;主要品种鲢、鳙的生长速度慢于同类湖泊。江湖隔绝和长期的人工增养殖生产作业方式,是导致涨渡湖鱼类区系逐渐简单化,鱼类多样性下降的重要原因。更多还原

【Abstract】 Fishery production model in Zhangduhu Lake is a semi-natural culture model,in which fries are mainly restocked into the lake artificially and they live on the natural feed in the lake while fishes propagate naturally in the lake as a compensation of the fishery resource.From 1992 to 2004,the fishery production varied between(3.69～50.61)×10~4 kg annually,in which the fishery production was higher than 10×10~4 kg in 9 years.The average annual output was between(2.77～201.77)×10~4 yuan,in which the output was higher than 50×10~4 yuan in 6 years.Recently,there are 47 fish species in Zhangduhu Lake,which has decreased by 38.2% when compared with the highest number of species in the lake’s history.The restocked fish accounted for more than 80% of the total captured fish,therefore,artificial restocking is the major source of fish.The age structure of the fish was simple and the capture tend to be young fish.The growth speed of the silver carp and bighead carp was lower than that of the same fish in similar lakes.The separation of Zhangduhu Lake with river and the long time artificial restocking of the fish population has resulted in the simplicity of fish species and decreased fish diversity of Zhangduhu Lake.更多还原