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作为长江仅存的两个通江湖泊之一,鄱阳湖在长江四大家鱼幼鱼的肥育方面有着重要意义。迄今为止,关于长江四大家鱼幼鱼进入鄱阳湖的相关问题仍不清楚。以鄱阳湖湖口水域为研究对象,分析湖口水域四大家鱼幼鱼出现的时间过程。根据2007~2008年监测,湖口水域四大家鱼幼鱼出现的时间集中在7、8月份,其中7月中下旬~8月底为青鱼、草鱼和鲢幼鱼的高峰期;而鳙幼鱼的高峰期在7月份。青鱼、鳙的体长主要为5.00~9.99 cm,草鱼、鲢以5.00~14.99 cm的个体为主。此外,2007和2008年湖口水域四大家鱼幼鱼均以鲢为主,鳙所占比例较小,且它们每天出现的数量都与湖口的水位呈正相关。这为深入研究长江四大家鱼幼鱼进入鄱阳湖的时间过程提供了基础资料。
As one of the two remaining rivers and lakes in the Yangtze River, Poyang Lake is of great significance in the fattening of the four major larvae of the Yangtze River. So far, the four major lakes on the Yangtze River into the Poyang Lake related issues are still not clear. Taking the Poyang Lake Estuary waters as the research object, the time course of the emergence of the four main larvae in the Hukou waters was analyzed. According to the monitoring from 2007 to 2008, the occurrence time of juvenile juveniles in Hukou waters concentrated in July and August, of which juveniles of black carp, grass carp and silver carp were peaked from the middle of late to the end of August; Peak in July. The main body length of herring and 鳙 is 5.00 ~ 9.99 cm, while that of grass carp and silver carp is 5.00-14.99 cm. In addition, the main juveniles of juveniles of domesticated juveniles in Hukou waters in 2007 and 2008 were mainly silver carp, while the percentage of juveniles was relatively small. Their daily occurrences were positively correlated with the water level in the estuaries. This provided the basic information for further studying the time course of the four larvae of the Yangtze River into Poyang Lake.