[Objectives]This study was conducted to investigate the feeding intensity of different sizes of grass carp on water hyacinth.[Methods]Grass carp of 10 sizes,i.e.,50,100,150,200,250,300,350,400,450 and 500 g,were put i...[Objectives]This study was conducted to investigate the feeding intensity of different sizes of grass carp on water hyacinth.[Methods]Grass carp of 10 sizes,i.e.,50,100,150,200,250,300,350,400,450 and 500 g,were put in cages.Thirty grass carp were stocked in each cage,and only water hyacinth was fed.The grass carp were caught after 120 d,and the food intake and growth of the grass carp were analyzed.[Results]The body weight of all sizes of grass carp increased significantly,and the overall length of grass carp increased significantly.Compared with feeding feed,the body length and body weight in the experimental treatments were lower,and they were more slender;and the feed coefficient of small-sized grass carp was slightly larger than that of large-sized grass carp.When the stocking size was above 414.7 g,the net weight gain of grass carp increased rapidly,and the total food intake also increased.[Conclusions]This study provides a theoretical basis for achieving an ideal purification effect of water hyacinth on aquaculture water by maintaining the growth of grass carp and the biomass and coverage of water hyacinth within suitable ranges.展开更多
基金Supported by Shandong Provincial Key R&D Program(2015GNC110014)National Staple Freshwater Fish Industrial Technology System(CARS-45-44).
文摘[Objectives]This study was conducted to investigate the feeding intensity of different sizes of grass carp on water hyacinth.[Methods]Grass carp of 10 sizes,i.e.,50,100,150,200,250,300,350,400,450 and 500 g,were put in cages.Thirty grass carp were stocked in each cage,and only water hyacinth was fed.The grass carp were caught after 120 d,and the food intake and growth of the grass carp were analyzed.[Results]The body weight of all sizes of grass carp increased significantly,and the overall length of grass carp increased significantly.Compared with feeding feed,the body length and body weight in the experimental treatments were lower,and they were more slender;and the feed coefficient of small-sized grass carp was slightly larger than that of large-sized grass carp.When the stocking size was above 414.7 g,the net weight gain of grass carp increased rapidly,and the total food intake also increased.[Conclusions]This study provides a theoretical basis for achieving an ideal purification effect of water hyacinth on aquaculture water by maintaining the growth of grass carp and the biomass and coverage of water hyacinth within suitable ranges.
