【摘要】 于1998年4～9月采用围隔实验生态学方法,为鲤、草鱼、罗非鱼、淡水白鲳及鲢、鳙设计了4种混养模式。经测定,淡水白鲳模式(FP)、草鱼模式(GC)和罗非鱼模式(TH)模式的光能利用率都随吃食性鱼类放养密度的增大而升高,GC和TH的光能利用率相对较高;总能量转化率以鲤模式(CC)和FP较高,TH最低;饲料能转化效率在FP最高,TH最低,而且各放养模式都随吃食性鱼类放养密度的增大而下降;FP的N利用率很高,TH最低,N和P利用率在4种模式都随吃食性鱼类放养密度的增大而减小;各模式的产投比都随吃食性鱼类放养密度的增大而增大,CC、TH的产投比在吃食性鱼类放养密度最大时有所下降。更多还原

【Abstract】 With landbased experimental enclosures set in one salinealkaline chloride water pond, the productive performances of four kinds of fed polyculture systems with different fish combinations were comparatively studied from April to September 1998 The results indicated that:the overall synthetic efficiency for solar radiation increased with the increase of stocking density of feeding fishes in FPsystem(freshwater pomphret), GC-system(grass carp) and THsystem(tilapia hybrid) The overall synthetic efficiency for solar radiation in GCsystem and THsystem was higher than that in the other systemsThe conversion efficiency for total energy was higher in CC-system(common carp) and FPsystem and the lowest in THsystem The conversion efficiency for feed energy was the highest in FPsystem and the lowest in THsystem, and decreased with the increase of stocking density of feeding fishes in each fed polyculture systemThe N and P utilizing efficiency all decreased with the increase of stocking density of feeding fishes in each fed polyculture systemThe net income of the four systems and the ratios of output to input of FPsystem in economy all increased with the increase of stocking density of feeding fishes The ratios of output in economy in enclosures with the highest stocking density of feeding fish of CC-system and TH-system reduced a little The net income in economy was the highest in FP-system, followed by THsystem,CC-system and GC-system in order更多还原