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                Achievements

                
            
    
            
    
                


    

    


    
 
  
    
   Title
   Research on high speed trawling of light trawls
  
    
  
    
   Year
   
    1978
    		
   Category& Level
   
    National Science Conference Award
    		
  
    
  
    
   Awardee
   Yang Yuean、Qiao Zhenpu、Fan Chuandai、Wang Wenxin
  
    
  
    
   Prizewinning unit
   Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences、Fisheries Company of Qingdao、Marine Fisheries Company of Shanghai
  
    
     

    
  
    
 
    Achievement Introduction:
    
 
    
     
    
    

    The original pair-trawling and Japanese trawls, which have the disadvantages of long wings, short body, inflated cod-end, thin net twine, small mesh, etc., were tested in this scientific achievement in order to catch the bottom fishes that high off the bottom and fast-swimming (i.e.Larimichthys polyactis,Trichiurus lepturus) by enlarging net opening, reducing net resistance and increasing towing speed. Results showed that:
    

    (1) It was conducive to increasing the vertical opening of net mouth, reducing net resistance ,increasing improve towing speed and expanding sweeping section area per unit time by optimizing net type, shortening wings length, enlarging mesh size of the net mouth and partial body, and increasing net mouth circumference. (2) The optimized gear can effectively increase the fishing yield, especially forTrichiurus lepturus. (3) The improvement of fishing gear also creats conditions for operation of net-hoist, which can shorten the time of net hauling and reduce labor intensity.
    

    
    
    
        


    

    


            
    
        
    
    
    
    

    







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