关键词: 桡足类, 种群结构, 中华绒螯蟹, 氵蚤状幼体, 生态育苗池

Abstract: This study was conducted to investigate the species composition, density,biomass,temporal and spatial distribution,and diel vertical migration of copepods in ecological breeding ponds,located at Liaohe Delta district to cultivate Eriocheir sinensis larvae.The result indicates that there are 7 copepods species:Eurytemor affinis,Sinocalnus tenllus,Calanus sinicus,Schmackeria inopinus,Halicyclops sp.,Schizopera sp.and Acartiella sp.,of which E.affinis and S.tenllus are dominant species in the ponds,and their mean density is 233 ind/L and 92.3 ind/L respectively.Moreover,the density of copepods in the ponds ranges from 20 to 1540 ind/L.During the breeding stage,the copepods density in downwind zone is significantly higher(P<0.01) than that in upwind zone,but during the pro-stage,it is similar in both zones.And in pro-stage,the vertical distribution rhythm of copepods is unconspicuous,while in breeding stage,the copepods density in bottom zone is higher(P<0.05) than that in surface zone.For diel vertical migration of copepods it is relatively uniform in both zones at night,but by daylight the copepods density in surface zone is higher than that in bottom zone.The data demonstrates that the temporal and spatial distribution characteristic of copepods is closely related with that of Eriocheir sinensis larvae in the ponds.

Key words: copepod, community structure, Eriocheir sinensis, zoeae larvae, ecological breeding pond