Investigation Of Aquatic Resources And Evaluation Of Fishery Production In Dongjiang Reservoir

In order to protect water resources in the Dongjiang Reservoir,and take care of the fisheries of Lake fisheries sustainable development.Group of Eastern martial-flow period(March 2006), the wet period(August 2006) and the dry season(January 2007),Ping Shek areas,scenic White Gallery,hwangcho areas,Chu Hau district,District Qingjiang(Doushuai area) and the dam area of the 27 sections of the water,plankton,benthos and primary productivity of water bodies to investigate and produce force evaluation carried out.The results are as follows:All the 30 water quality monitoring in the vast majority of indicators are indicators showed that the water quality in the political arena surface water ClassⅡand above,only a very small number of indicators point to some of the surface water content higher than ClassⅡ.From the nutrition level of the index,the East River water-water-nutrient level in the period and a dry season in the nutrition level of surplus water into the beginning of the level of eutrophication.However,with the opening of the dam and the water into a tributary of precipitation,as well as supply,together with the self-Lakes,East arena in the dry season and returned to clear the state of water nutrient level in the return-nutrition.According to the type of phytoplankton,east of the arena should be the type of lake as a "silicon-blue-green algae." East of the dominant species of phytoplankton in the political arena for the particles Melosira,a small Central algal stars,Chlorella vulgaris,Scenedesmus,as well as hidden algae species,such as bare.Through the East floating algae dominant species in the political arena,the average density and biodiversity into consideration,we can see that the East is now in the political arena by nutrient-eutrophic lake to lake-transition period.Lakes zooplankton biomass for an average of 11.04 mg/L,in the light of zooplankton biomass-based nutritional status of the lake standards,the East River in a reservoir,"tends to eutrophication."East River water in the body 0,0.5,1.0,2.0 transparency and about 3.0 times the Department hung black-and-white bottles of water measuring primary productivity.East arena in July the average daily output for the water district 5.74 gO2/m2·d,10 average to 5.67 gO2/m2·d.East arena on water production and total nitrogen,total phosphorus,total nitrogen and total phosphorus ratio,ammonia,chlorophyll concentration was positively related to the basic.With the concentration of chlorophyll Among the most significant,the R2=0.548;followed by the total phosphorus and ammonia related to the Department,the R2 were 0.483;again with the total nitrogen and total phosphorus ratio,the correlation coefficient was 0.220;is the last of the total N,R2 to.090(Figure 4).East River water body the size of the primary productivity may be the direct performance of the high and low concentrations of chlorophyll,and total phosphorus, nitrogen concentration is the size of the primary decision factor productivity.Although the total nitrogen concentration in the East political arena is relatively high,but its primary productivity does not play a decisive role.Ability to estimate fish:East arena of natural biological resources to provide the total fish productivity 11213.08 t,equivalent to 909.3 kg/hm~2.