Hydrobiology of a flooding ecosystem. Lake Chenhu in Hanyang, Hubei, with preliminary estimation of its potential fisher production capacity

다국어 초록 (Multilingual Abstract)

For the purpose of fishery development, a hydrobiological investigation of Lake Chenhu was carried out in 1983 with reference to the productivity of various food organisms as well as fish. Of the entire lake, the annual net primary production was determined to be 27,818 x 10? kcal for wet land vegetation. The annual secondary production chiefly from gastroposd was 2,632 x 10?kcal. On the basis of 1981-1982 fishery data, the production of the main stocked fishes in the lake was also roughly computed. Analysing all obtained production data. we find the energy conversion rate of food organisms to fish in the water at the present stage is fairly low. Even in 1982, the year of beller fishery management, food energy converted to plankton feeders or herbivores was only 1.6-1.8%: energy converted to fish yield was even lower, only 0.2-0.8%. To get a potential fish output of the ecosystem, a lentative estimation of fishery capacity of Lake Chenbu was made by uning the index of fond quotionts and relevant conversion factors. The theoretical fish production in the lake is estimated to be around 6,000 and through the improvement of fishery management and annual fish yield of 2,000 can be experted.