Study on fish community structure in the Zhujiang Estuary and its adjacent waters

Based on data of demersal trawl samples from 1987 to 1988 in the Zhujiang Estuary and its adjacent watens,relationships between fish community and environmental factors are studied by using classification,MDS ordination and several community parameters.The results show that the distribution of fish species is zoned by salinity and divided into three types.The freshwater community which is restricted in the Lianhua Hill-Humen waterway is simple and stable,the coastal community which lives in the shallow waters is canplex,and the estuary community which is identified in the Lingdingyang area and affected by physical and eool by cal processes more greatly has obvious seasonal variations.