论文部分内容阅读
2004年3月-2005年3月,按月在长江口沿岸碎波带沿海岸平行方向,用小型拖网共采集到仔稚鱼6 892尾,属于23科,约50种。其中科的刀鲚占总个体数的55.19%,其后依次为银飘鱼(16.99%)、鱼(10.94%)、纹缟虾虎鱼(3.92%)、斑尾刺虾虎鱼(2.67%)、鳜(1.68%)、少鳞(1.68%)、普氏细棘虾虎鱼(0.99%)、弹涂鱼(0.99%)、黄鳍刺虾虎鱼(0.89%),这10种的个体数占据了总捕获个体数的96%。长江口沿岸碎波带中,既生活着洄游性鱼类和河口性鱼类仔稚鱼,还生活着近岸海水鱼类和淡水鱼类仔稚鱼。该水域仔稚鱼的种类和平均密度具有季节性变化趋势。根据在长江口沿岸碎波带仔稚鱼的出现和季节性变化规律,对该水域的仔稚鱼资源提出了保护措施。
From March 2004 to March 2005, a total of 6 892 larvae of larvae were collected by small trawls along the coast of the Yangtze River estuary on a monthly basis along the coast of the Yangtze River estuary. They belonged to 23 families and about 50 species. Among them, Dracaena diversifolia accounted for 55.19% of the total individuals, followed by Silverside (16.99%), fish (10.94%), Goby (3.92%), (0.68%), Scutellaria barbata (1.68%), Przewalski’s goby (0.99%), Bombyx mandarinus (0.99%) and Grouper goby 96% of the total captured individuals. In the wave zone along the mouth of the Yangtze River estuary, both migratory fish and mouth fish larvae live as well as nearshore and freshwater fish larvae. The species and average density of larvae in this area have seasonal changes. According to the occurrence and seasonal variation of juvenile larvae in the rifted zone along the mouth of the Yangtze River, protective measures have been put forward for juvenile fish resources in this area.