Fish Catches Analysis and Fishery Management in Lake Taihu

Based on the historic data of fish catches and an investigation on fish resources during Sep.-Dec.in 2012 in Lake Taihu,the dynamic variation of fishery resources and their spatial distribution characteristics were analyzed.The results showed the total fishery yield had increased quickly in recent years,and the percentage of small fishes had increased in fish catches,while the percentage of other large fishes had decreased rapidly.The tendency of smaller-scale fishery in Lake Taihu was more obvious.The main fishing catches of fish trap and bottom trawl concentrated in the beginning of the opening date and the fish density in different lake regions was in the order of center region of Lake Taihu eastern lake region northern lake region.Compared with fishery resources of different lake areas,the results indicated that planktivorous fish had the highest resource density in the center lake region,while the density of herbivorous fish was relatively higher in the eastern lake region,and these obvious differences among the compositions of catches in different lake regions reflected the influence of biological resources on the compositions of fishery resources.Finally,some management measures were offered to control the tendency of smaller-scale fishery based on the present research,such as controlling the fishing gear specifications and catching intensity,adjusting the catching time and raising the number of stocking large fish.