Research On Cultivation Techniques And Implications Of Eriocheir Sinensis In Yellow River Estuary

Eriocheir sinensis,is a special product in China. It's main distributed fields include seaboard of the Donghai Sea and the Bohai Sea and off shore rivers and lakes.Since 1980s,the production of Eriocheir sinensis has gradually changed from natural fish to artificial culture,and it's great production scale also becomes pillar industry of our country. This research discusses about potential problems and their solutions during aquaculture.The results of research shows that the beneficial results of industrial production of Eriocheir sinensis in Yellow River estuarys will take a step forward only if attention is paid to the quality of parental kind of merchandise crabs.Aquaculture of Eriocheir sinensis in Yellow River estuarys in large scale not only serves to the increase of yield and benefit,but also becomes a production mode that meets the need of uncontaminated food in recent markets.The basic principle is to realize culture in large scale through improvement of selective kinds and regulation of ecosystem,and to culture uncontaminated crabs of bigger size and higher quality. Considering quality of kind,feed, water and bottom of crab culture,and crucial technicalities like prevention and cure of diseases, combined with sorts of experiments,demonstrations and conclusions,this research elucidates technical requirement and practical method of Eriocheir sinensis in Yellow River estuarys culture in large scale.Quality of kind-requirement of quality of parental crabs,means how to select is cardinal requirements.Qualities of feed and water are material assurance of high productivity, which are related to the study of nutrition need of crabs,production of mixed feed and rational distribution of feed.The technical index sign should be in consistent with the technique standard of producing uncontaminated food,and the aqueous environment should comply with regulations of《Water quality of fresh-water culture》.Temperature of water is under control by means of growing water plant,conditioning water level and so on.Bottom of ponds is the main habitat of crabs,and the environment in the bottom of river influences crab's growth significantly,which should be improved through clearing up,growing water plant and utility of microorganism to benefit prevention and control of diseases.As to the application and research of aquaculture of crabs in large scale,after improving water quality with microorganism,the reporter finds that the utilization of feed by crabs increases,and the feed coefficient is reduced by 0.5,compared with results of the control pond in the corresponding period. At the same time,the livability of crabs increases by 7.5% and yield per acre increases by 12kg after using the microorganism.Through study of growing tape grass in pond,the reporter finds that there are manifest advantages of growing tape grass:the grass absorb nitrogen,phosphorus, heavy metals and help to reduce water temperature.The average size of each crab is bigger than that of control pond by 15g to 50g in the same conditions of raising density,which leads to a significant increase in benefit.Based on the practical conditions of current production,this report lists some major problems involved in culture of Eriocheir sinensis in Yellow River estuarys in large scale,and presents some available solutions and utilitarian methods,and the outcome of the study has been applied,and good results had been achieved.