饲料颗粒大小对鲤生长的影响

The Role of Food Particle Size in the Growth of Juvenile Carp(Cyprinus carpio L.)

室内水族箱和室外网箱饲养试验表明，水温２０～２５℃时，体长８．５～８．９ｃｍ和１５．０～１５．３ｃｍ的鲤摄食直径为３．０和４．０ｍｍ的颗粒饲料生长最快，饲料系数最低，我国北方网箱养鲤在５、６、７～８和９月应分别投喂直径３、４～５、６和４ｍｍ的颗粒饲料，应用最佳饲料的直径与体长比（ＰＦＲ）时，除考虑鱼体长（口径）外，还应考虑影响鲤消化的相关因素。水温高于２０℃时，鲤的ＰＦＲ应为０．０２６～０．０３５，低于２０℃时为０．０１８～０．０２５。

The effect of particle size of a commercial pelleted feed on the growth of common carp(Cyprinus carpio L. )from juvenile to adult was investigated using aqarium feeding and cage culture experiments. Twenty juveniles ( 8.5─8.9 cm and 15.0─15.3 cm in body length)were reared in one of six aquaria(80 cm ×100 cm × 60 cm)and presented with one of six sizes of food particles throug 1,2,3,2,4 to 6 mm. Fish varying from 8.5 to 8.9 cm in body length showed maxi-mum growth on particle diameter of 3 mm and fish from 15.0 to 15.3 cm in body length on 4 mm-diameter particle, Twenty juveniles(14.8±1.8 cm in body length) were reared in one of three 100 cm × 80 cm × 60 cm-cages and fed withone of three sizes of food particles,(diameter of 4,5 ,and 6 mm) from May to September in 1992 and 1993. At water temperature of over 20 ℃ , fish grewrapidly on particle diameter 0.026 to 0.035 X fish body length (PFR)but 0.018 to 0.025 atbelow 20℃,i.e.carp showed maximum growth when they were fed with 3,5, 6 and 4 mm diameter food particles in May,June,July-August and September, respectively.