长江口渔场拖网渔业资源利用的结构分析

利用长江口渔场20世纪90年代的拖网生产资料，分析该渔场拖网生产的渔业资源种类及优势种的变化状况。结果表明：渔获物以底层鱼类为主，但是中上层鱼类也占有一定的比例；按照资源稳定状况，渔获物分为三种：1、资源状况较稳定的，如带鱼、小黄鱼、银鲳、梅童鱼；2、资源状况波动较大的，如鳓鱼、黄姑鱼、白姑鱼、海鳗、刀鲚、大黄鱼等；3、小型低值鱼，主要代表鱼种为黄鲫和龙头鱼。这些资源的稳定与否除了受高强度的捕捞和环境污染的影响外，在一定程度上与该物种对环境变化和外界压力的调节能力以及生命周期长短等因素有关。

Structure analysis on the utilization of trawl fishery resources on the fishing grounds of the Changjiang estuary

Based on the data of trawl production in the fishing grounds of the Changjiang estcuary in the 1990s,the paper analyzed the status of fishery resource varieties in trawl production. The results indicated that the demersal fish was the dominant species, but the pelagic fish possesses a definite proportion. In accordance with the stabilization of fishery resources, the catches were divided into three types: 1. More stable resources, such as Trichiurus japonicus,Pseudosciaena polyactis, Pampus argenteus, Collichthysspp. 2.Species fluctuated widely, such as Ilisha elongata, Nibea albiflora,Argyrosomus argentatus,Muraenesox cinereus, Coilia ectenes, Pseudosciaena crocea etc. 3. Small and low-priced fish, Setipinna tatyand Harpadon nehereus were its main representative fish. The stability of these resources not only was affected by high fishing intensity and environmental pollution but also of certain concerned with their ability to adjust the changes and pressure of environment and their life circles as well.