汉江中下游水文特点与渔业资源状况

通过对汉江中下游水文特点和渔业资源状况的研究,分析了该区域水文与饵料生物、渔业资源的关系。结果表明:汉江中下游中段的水文变化趋势适宜于产漂流性卵鱼类的繁殖;由于水文状况,汉江中下游的鱼类生长与繁殖季节晚于长江干流;4—6月的水文状况适宜下游江段饵料生物的生长;汉江中下游的饵料生物丰富,为鱼类的生长与繁殖提供了良好条件;汉江下游主要经济鱼类年龄组成简单,种群中以小型鱼类为主。

Hydrological characteristics and fishery resources status of mid-lower Hanjiang River

Based on the investigation of hydrological characteristics and fishery resources status of mid-lower Hanjiang River,this paper studied the relationships among the hydrology,food organisms,and fishery resources in this region.The results showed that the hydrological status of the mid section of mid-lower Hanjiang River was suitable for the reproduction of floating eggs-laying fish.Because of the hydrological status,the spawning and growth seasons started later in mid-lower Hanjiang River than in the main stream of Yangtze River.From April to June,the hydrological status in the lower section of mid-lower Hanjiang River favored the growth of food organisms.The abundant food organisms provided a good condition for fish growth and reproduction.The age composition of the main economic fish species in the lower section of mid-lower Hanjiang River was quite simple,with small fish as dominant in the population.