The Lu-Kang mud shrimp Upogebia edulis is one of the famous seafood at coastal area of central Taiwan.Since 1993, twelve groups of fishermen introduced the new hydraulic dredging methods to increase fisherr output.The new method substantially increases production and profit, but it may have impact on the shrimp population. Thestructure of fishing ground maybe disturbed too much so thaat the recovery of the shrimp populationis retarded. For this research, a field survey was conducted at Sheng-Kang intertidal area from April to December 1997. The auther investigated the fishing methods,amount of the production and the market price.In the begening, the auther labeled the last four years of mud shrimp that were harvesedby three fishing methods. This methods include traditional digging, the ocntiguous and non-contiguous hydraulic dredging method.Afterwards, the authet estimated the density and biobass of mud shrimp and compared the recovery rate to the population of the non-harvested neighboring area.
